=
Hi all,

I think APN can work well in Game Acceleration scenario.  With APN Operators can=
 provide highly customized and flexible services for applications and improve the qualit=
y of experience of users.

In the the draft=A3=BAhttps://tools.ietf.org/html/draft-zhang-apn-accelera=
tion-usecase-00, we introduce two typical g=
ame acceleration scenarios with  APN.

If you are intereste=
d in it, we can have more discussion.

From: Pengshuping= (Peng Shuping)<mailto:pengshuping@huawei.com>=0A= Date: 2020-08-24 17:17=0A= To: apn@ietf.org<mailto:apn@ietf.org>=0A= Subject: [Apn] APN Use Cases=0A= Dear all,=0A= We have been exploring the use cases that could benefit from APN.=0A= Some use cases in Edge Computing have been listed in the draft: https://tools.ietf.org/html/draft-l= iu-apn-edge-usecase-00=0A= Some use cases in Game Acceleration have been listed in the draft: https://tools.ietf.or= g/html/draft-zhang-apn-acceleration-usecase-00=0A= What do you think about these use cases? What are the benefits that can be = brought by APN? Would you like to share some other use cases that are valua= ble to you?=0A= Thank you!=0A= Best regards,=0A= Shuping

late in the discus= sion, but wanted to share some thoughts:

One of the first successful proof-points for SDN was Google c= laiming that they moved their WAN utilization to ~100%, instead of over= -provisioning. It saved them lots of money. Two of the design principles th= at led them there were

i) moving from "all p= ackets are equally important" to "allocate resources based on appli= cation-level priorities" and=C2=A0

ii) moving= from "TCP flows regulated by "fair share" mechanisms" to &= #34;measure demands, and shape flows at the endpoints".

I can imagine offering low-latency S= LA for 1% of the traffic (say video calls), is much cheaper and easier than= doing this for all Internet traffic (with the cost varying whether you are= in Europe/US or an emerging market, rural or urban, a WISP, a low-orbit sa= tellite network, etc). Could anyone from operator-land commen= t on the economics of oversubscription/overprovision/SLAs in the mobile wor= ld?

(btw: we alrea= dy have SLAs today=C2=A0--- VoLTE is IP traf= fic routed through dedicated radio and wired resources and has materially b= etter network quality and reliability than plain VoIP, and when you sign-up= for a broadband connection you can get 10Mbps/100Mbps/1Gbps etc).

If over-provis= ioning wins (in 10 years) it will likely be the outcome of the network comm= unity's=C2=A0 failure to find a good solution for traffic differentiati= on, rather than a verdict that these use cases were not important enough.= =C2=A0

FWIW: there are many issues to debate around fine-grained traf= fic differentiation beyond overprovisioning (like security, scalability, pr= ivacy, net neutrality), and there are different approaches one could take (= APN and network tokens have different design principles and priorities on t= hese trade-offs).=C2=A0

Best,

Yiannis

<= br/>

=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Yiannis= Yiakoumis

Co-Founder & CEO

https://selfienetwo= rks.com | +1-650-644-7857

On Tue, Sep 22, 2020 at 8:29 AM, Chri= stian Huitema <huitema@huitema.net> wrote:

On 9/21/2020 11:44 PM, Lars Eggert wrote:

Hi,
On 2020-9-22, at 9:02, zhangs366@chinaunicom.cn<= /a> wrote:
[Shuping] Again APN is aimed to work within a controlled and limited operat= ors=E2=80=99 network domain not for Internet.
that significantly limits the attractiveness of this proposal to applicatio= n vendors. They can either buy into APN and ship an app that only works in = some (initially, very few to none) operator networks. Or, they can ship a s= lightly less optimal app that works on the entire Internet with its billion= s of users.
More broadly, I'd like to point out that during the entire history of t= he Internet there were application classes that the deployed networks at th= e time were struggling to support. There were always claims that something = like APN was needed, i.e, solutions that were intending to improve network = performance and quality but that were also adding significant complexity an= d often required application changes.

Yes indeed. In the 90's the argument was around video conferencing, which "obviously" could not work on a plain best effort service. An= d then we got Skype.

What always happened so far was that Moore's law solved these problems,= by improving the performance and quality of the general Internet so that b= est effort was sufficient to support all these "special" applicatio= ns a few years down the road.

Yes. Indeed the whole history of wireless is driven by Moore's law. For example, the theory of MIMO has been known for some time, put the application and the use of large number of input and output is only possible because of progress in electronics.

The same will happen with the use cases presented to motivate the need for = APN. The general Internet may struggle to support them now, but in five yea= rs or so - which is about the time horizon for any APN enablement of any op= erator network to happen - these will just work.

More bandwidth solves a lot of these issues. But we can also expect improvement in transport protocols and in queue management. Active Queue Management techniques can isolate different data streams and prevent stupid issues like "my daughter playing video games is degrading my VPN". New congestion control protocols like BBR actively manage queuing delays, resulting in significantly lower latency overall. And then application just get smarter in their use of caches, redundancy, gap filling, etc. All that is guaranteed to improve over time.

-- Christian Huitema

--=20
Network-tokens mailing list
Network-tokens@ietf.org
https://www.ietf.org/mailman/listinfo/network-tokens

--6f8f041d1a668943c30c0b69b6ecb6eabac19122d0716be7f1af81e0f3ac-- From nobody Mon Sep 28 10:33:21 2020 Return-Path: X-Original-To: apn@ietfa.amsl.com Delivered-To: apn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 53E373A12E9; Mon, 28 Sep 2020 10:33:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gQAFMeXuy_-d; Mon, 28 Sep 2020 10:33:13 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 42C6B3A12D5; Mon, 28 Sep 2020 10:33:13 -0700 (PDT) Received: from lhreml710-chm.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 00AF2FE36336BD08C371; Mon, 28 Sep 2020 18:33:09 +0100 (IST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Mon, 28 Sep 2020 18:33:09 +0100 Received: from DGGEMM403-HUB.china.huawei.com (10.3.20.211) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.1.1913.5 via Frontend Transport; Mon, 28 Sep 2020 18:33:09 +0100 Received: from DGGEMM532-MBX.china.huawei.com ([169.254.7.14]) by DGGEMM403-HUB.china.huawei.com ([10.3.20.211]) with mapi id 14.03.0487.000; Tue, 29 Sep 2020 01:33:06 +0800 From: Lizhenbin To: Linda Dunbar , IPv6 List , "draft-li-6man-app-aware-ipv6-network@ietf.org" CC: "apn@ietf.org" Thread-Topic: Questions about draft-li-6man-app-aware-ipv6-network-02 Thread-Index: AdaTZqEn8gTX6C5CTS2Ceg4YlCkN3QCT/e9Q Date: Mon, 28 Sep 2020 17:33:06 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D938909C6@DGGEMM532-MBX.china.huawei.com> References: In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.218.208] Content-Type: multipart/alternative; boundary="_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D938909C6DGGEMM532MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Apn] Questions about draft-li-6man-app-aware-ipv6-network-02 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Sep 2020 17:33:15 -0000 --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D938909C6DGGEMM532MBXchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Linda, Please refer to my reply inline. APN mailing list is copied. Best Regards, Zhenbin (Robin) From: Linda Dunbar [mailto:linda.dunbar@futurewei.com] Sent: Saturday, September 26, 2020 2:23 AM To: IPv6 List ; draft-li-6man-app-aware-ipv6-network@ietf.or= g Subject: Questions about draft-li-6man-app-aware-ipv6-network-02 Zhenbin, et al, I have some questions on the draft-li-6man-app-aware-ipv6-network-02: Page 5: App-aware Edge Device: This network device receives packets from IP= v6 enabled applications and obtains the application characteristic informat= ion. I am curious how does App-aware Edge Device derives the application charact= eristics information ? Your draft mentioned VLAN tagging, How VLAN tagging= can provide Application characteristics information? [Robin] There are different ways for VLAN tagging to provide application ch= aracteristics information. Here I propose one example: the user hosts/apps = can connect to the home gateway which can add different VLANs called S-VLAN= to identify the different services. For example VLAN1 is used for Internet= service and VLAN2 is used for IPTV service. The home gateway will connect = to the DSLAM on which the VLAN call C-VLAN will be added to identify the ho= me user. So when the IP-based edge network device receives the packet, it c= an derive the user ID and service type information from the VLAN tagging. W= e have explained that the APN work focuses on the limited domains rather th= an open Internet. The VLAN tagging shows that there is similar practice in = the access network. Page 6: Is the Application-aware ID another extension field? Or part of exi= sting extension header? Like a subTLV within the Hop-by-hop options Header = Type? [Robin] Application-aware ID is an option which can be used in DOH/HBH/SRH.= It is part of existing extension headers. It can be seen as a type of TLV. Questions about the Application-Aware ID structure in Figure 4: Why not use IPv6 Header "Priority/Traffic class" field to represent the SLA= Level? [Robin] The design is to take integrity into account. That is, all the info= rmation can be obtained from the single Application-aware ID. Traditionally= we can get different parts' information to compose some type of tuple. The= process has effect on the forwarding performance and the scalability of fo= rwarding entries. Can you use IPv6 Header's "Flow Label" field to represent the App ID and Fl= ow ID? [Robin] Integrity is the same reason for the problem. In addition "flow lab= el" will be used for ECMP. Reusing it may cause the compatibility issue. How can network acquire the information about "USER" information? I would t= hink most applications encrypt their user information. [Robin] The above example shows that C-VLAN can be used to acquire USER inf= ormation. Though the application may encrypt their user information, not on= ly APN needs the USER information, but also the carriers need to learn the = USER information for accounting to get revenue. There already exists the po= ssible way to solve the issue. What kind of functions do you envision to be listed in the Figure 6's Funct= ion ID? [Robin] Figure 6 is to reuse the SRv6 SID. The function ID means just the f= unctions supported by the existing SRv6. The Application-aware ID is put in= to the arguments of the SRv6 SID. The function ID part will not have effect= on the Application-aware ID. [Robin] Thanks for your comments and questions. Now the draft is in the ear= ly phase. The usage of the Application-aware ID option can be further discu= ssed. Thank you very much. Linda Dunbar --_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D938909C6DGGEMM532MBXchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Linda,

Please refer to my reply inline. APN mailing list is copied.=

Best Regards,

Zhenbin (Robin)

From: Linda Dunbar [mailto:linda.dunbar@futurewei.com]
Sent: Saturday, September 26, 2020 2:23 AM
To: IPv6 List <ipv6@ietf.org>; draft-li-6man-app-aware-ipv6-ne= twork@ietf.org
Subject: Questions about draft-li-6man-app-aware-ipv6-network-02

Zhenbin, et al,

I have some questions on the dr= aft-li-6man-app-aware-ipv6-network-02:

Page 5: App-aware Edge Device: = This network device receives packets from IPv6 enabled applications and obt= ains the application characteristic information.

I am curious how does App-aware= Edge Device derives the application characteristics information ? Yo= ur draft mentioned VLAN tagging, How VLAN tagging can provide Application c= haracteristics information?

[Robin]= There are different ways for VLAN tagging to provide application character= istics information. Here I propose one example: the user hosts/apps can con= nect to the home gateway which can add different VLANs called S-VLAN to identify the different services. For exam= ple VLAN1 is used for Internet service and VLAN2 is used for IPTV service. = The home gateway will connect to the DSLAM on which the VLAN call C-VLAN wi= ll be added to identify the home user. So when the IP-based edge network device receives the packet, it can= derive the user ID and service type information from the VLAN tagging. We = have explained that the APN work focuses on the limited domains rather than= open Internet. The VLAN tagging shows that there is similar practice in the access network.

Page 6: Is the Application-awar= e ID another extension field? Or part of existing extension header? Like a = subTLV within the Hop-by-hop options Header Type?

[Robin]= Application-aware ID is an option which can be used in DOH/HBH/SRH. It is = part of existing extension headers. It can be seen as a type of TLV.

Questions about the Appli= cation-Aware ID structure in Figure 4:

Why not use IPv6 Header “= Priority/Traffic class” field to represent the SLA Level?

[Robin]= The design is to take integrity into account. That is, all the information= can be obtained from the single Application-aware ID. Traditionally we can= get different parts’ information to compose some type of tuple. The process has effect on the forwarding performance a= nd the scalability of forwarding entries.

Can you use IPv6 Header’s= “Flow Label” field to represent the App ID and Flow ID?

[Robin]= Integrity is the same reason for the problem. In addition “flow labe= l” will be used for ECMP. Reusing it may cause the compatibility issu= e.

How can network acquire the inf= ormation about “USER” information? I would think most applicati= ons encrypt their user information.

[Robin]= The above example shows that C-VLAN can be used to acquire USER informatio= n. Though the application may encrypt their user information, not only APN = needs the USER information, but also the carriers need to learn the USER information for accounting to get revenue.= There already exists the possible way to solve the issue.

What kind of functions do you e= nvision to be listed in the Figure 6’s Function ID?

[Robin]= Figure 6 is to reuse the SRv6 SID. The function ID means just the function= s supported by the existing SRv6. The Application-aware ID is put into the = arguments of the SRv6 SID. The function ID part will not have effect on the Application-aware ID.

&n= bsp;

[Robin] Thanks for your comments and questions. Now the draft is in the= early phase. The usage of the Application-aware ID option can be further d= iscussed.

Thank you very much.

Linda Dunbar<= /p>

--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D938909C6DGGEMM532MBXchi_-- From nobody Mon Sep 28 17:54:39 2020 Return-Path: X-Original-To: apn@ietfa.amsl.com Delivered-To: apn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C3AAB3A0836; Mon, 28 Sep 2020 17:54:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q577zw-XAxIe; Mon, 28 Sep 2020 17:54:32 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) 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"architecture-discuss@iab.org" , "network-tokens@ietf.org" Thread-Topic: Question List for APN: Q#8 Thread-Index: AdaV+p6hlEeaFy+VRQKsQQJkF8vE1w== Date: Tue, 29 Sep 2020 00:54:25 +0000 Message-ID: <4278D47A901B3041A737953BAA078ADE19435D07@dggeml512-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.153.195.37] Content-Type: multipart/alternative; boundary="_000_4278D47A901B3041A737953BAA078ADE19435D07dggeml512mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Apn] Question List for APN: Q#8 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Sep 2020 00:54:35 -0000 --_000_4278D47A901B3041A737953BAA078ADE19435D07dggeml512mbxchi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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<4278D47A901B3041A737953BAA078ADE19435F17@dggeml512-mbx.china.huawei.com> References: <4278D47A901B3041A737953BAA078ADE19424A8B@dggeml512-mbx.china.huawei.com> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.153.195.37] Content-Type: multipart/alternative; boundary="_000_4278D47A901B3041A737953BAA078ADE19435F17dggeml512mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Apn] [Network-tokens] [arch-d] Questions for APN: Q#6 and Q#7 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Sep 2020 01:30:59 -0000 --_000_4278D47A901B3041A737953BAA078ADE19435F17dggeml512mbxchi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgVG9ueSwNCg0KUGxlYXNlIHJlZmVyIHRvIHRoZSBmb2xsb3dpbmcgZHJhZnRzLiBTb21lIHJl 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--_000_4278D47A901B3041A737953BAA078ADE19435F17dggeml512mbxchi_-- From nobody Mon Sep 28 18:36:31 2020 Return-Path: X-Original-To: apn@ietfa.amsl.com Delivered-To: apn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5AD53A0CC0; Mon, 28 Sep 2020 18:36:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pGQDTmneTiUQ; Mon, 28 Sep 2020 18:36:25 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate 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(Peng Shuping)" To: Yiannis Yiakoumis , Christian Huitema CC: "network-tokens@ietf.org" , =?utf-8?B?5pu555WF?= , "zhangs366@chinaunicom.cn" , "architecture-discuss@iab.org" , apn , Lars Eggert Thread-Topic: [Network-tokens] [Apn] [arch-d] Questions for APN: Q#5 Thread-Index: AQHWkKvvTZwBfLSoZUKsj72e23Vfk6l0QsoAgAU7PYCABWFs0A== Date: Tue, 29 Sep 2020 01:36:16 +0000 Message-ID: <4278D47A901B3041A737953BAA078ADE19435F40@dggeml512-mbx.china.huawei.com> References: <2020092211271508522412@chinaunicom.cn> <4FEADB2A-A062-44B4-8D36-3651EBDD1ACD@eggert.org>

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[67.169.103.239]) by smtp.gmail.com with ESMTPSA id f6sm6609786pfq.82.2020.09.29.14.31.41 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 Sep 2020 14:31:42 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: <7CBE7FAD-4544-4DA0-93D5-99BFB09E9AF8@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_24116701-48D8-4864-9955-D25C79E18931" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Date: Tue, 29 Sep 2020 14:31:38 -0700 In-Reply-To: <4278D47A901B3041A737953BAA078ADE19435F17@dggeml512-mbx.china.huawei.com> Cc: "apn@ietf.org" , "network-tokens@ietf.org" , "architecture-discuss@iab.org" To: "Pengshuping (Peng Shuping)" References: <4278D47A901B3041A737953BAA078ADE19424A8B@dggeml512-mbx.china.huawei.com> <4278D47A901B3041A737953BAA078ADE19435F17@dggeml512-mbx.china.huawei.com> X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: Re: [Apn] [Network-tokens] [arch-d] Questions for APN: Q#6 and Q#7 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Sep 2020 21:31:46 -0000 --Apple-Mail=_24116701-48D8-4864-9955-D25C79E18931 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Shuping, > https://tools.ietf.org/html/draft-li-6man-app-aware-ipv6-network-02 = > =20 > Basically, the information carried in the IP layer is used for traffic = steering policy selection within a limited APN network domain in order = to guarantee the SLA requirements. > =20 I=E2=80=99m a little unclear on what I=E2=80=99m reading, so please = pardon some clarifying questions. In this document, I=E2=80=99m seeing two options defined for use in IPv6 = extension headers. The application aware ID option appears to be up to 255 bytes long, = variable length, and consists of three different structures. How does the forwarding engine determine which structure is in use? Can = this option appear multiple times in the header?=20 Within each structure, the fields are variable length, but there appears = to be no way to determine how long the fields are. The service-para option appears to be a bit more structured. Again, = this appears to be variable length, up to 255 bytes. Within the option, we have numerous subTLVs. What is the purpose of the = RESERVED fields? If you=E2=80=99re trying to retain alignment, didn=E2=80=99t that go out the window with a two byte option header? Does the delay sub-TLV indicate the overall path delay? Or the per-hop = delay? If the full path delay, how does a router know whether this has been satisfied? Do systems along the path decrease = this value as the packet is forwarded? How does a router know how much to decrement? Is 24 bits really necessary for the Delay Variation? Is a jitter of 16s = even meaningful? The packet loss ratio is a 24 bit (presumably unsigned) value. Is this = an integer? Normally ratios are expressed as a relation between multiple integers. What are the semantics here? Have you computed the amount of overhead that you will be introducing? = It appears to me that you could easily have 1000 bytes of overhead per = packet. What does=20 this do to service provider bandwidth consumption? What does this do to = the =E2=80=98low-latency=E2=80=99 service that you want to provide? Tony --Apple-Mail=_24116701-48D8-4864-9955-D25C79E18931 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Hi Shuping,

https://tools.ietf.org/html/draft-li-6man-app-aware-ipv6-networ= k-02

Basically, the = information carried in the IP layer is used for traffic steering policy = selection within a limited APN network domain in order to guarantee the = SLA requirements.

I=E2=80=99m a little unclear on what I=E2=80=99m = reading, so please pardon some clarifying questions.

In this document, I=E2=80=99m seeing two options = defined for use in IPv6 extension headers.

The application aware ID option appears to be up = to 255 bytes long, variable length, and consists of three different = structures.

How does the forwarding = engine determine which structure is in use? Can this option appear = multiple times in the header?

Within each structure, the = fields are variable length, but there appears to be no way to determine = how long the fields are.

The = service-para option appears to be a bit more structured. Again, = this appears to be variable length, up to 255 bytes.

Within = the option, we have numerous subTLVs. What is the purpose of the = RESERVED fields? If you=E2=80=99re trying to retain = alignment,

didn=E2=80=99t that go out the window with a two = byte option header?

Does the delay = sub-TLV indicate the overall path delay? Or the per-hop delay? If = the full path delay, how does a router know

whether this has = been satisfied? Do systems along the path decrease this value as = the packet is forwarded? How does a router

know how much to = decrement?

Is 24 bits really = necessary for the Delay Variation? Is a jitter of 16s even = meaningful?

The packet loss ratio is = a 24 bit (presumably unsigned) value. Is this an integer? Normally = ratios are expressed as a relation between multiple

integers. = What are the semantics here?

Have = you computed the amount of overhead that you will be introducing? It = appears to me that you could easily have 1000 bytes of overhead per = packet. What does

this do to service provider = bandwidth consumption? What does this do to the =E2=80=98low-latency=E2=80= =99 service that you want to provide?

Tony

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Hi Yiannis, =

I agree that offering low-latency SL= A for 1% of the traffic is easier and cheaper than all internet traffic. It's bet= ter to guarantee the SLA of some critical traffic first. However, it should also strike a balance between benefit= s and costs.

Some new technologies such as network slice, APN may help to solve the problem and meet the demand of fine-grained traffic. Therefore, I think fine-grained traffic require= ments are necessary, which can help to save network resources, and over con= figuration may waste network resources.

Regards,

Peng (China Mobile)&nbs= p;

Peng Liu | =C1=F5=C5=F4

China Mobile | =D2=C6=B6=AF=D1=D0=BE=BF=D4=BA

mobile phone=A3=BA13810146105

email: liupengyjy@chinamobile.com/liupengyjy@outlook.com

=B7=A2=BC=FE=C8=CB: Apn <= ;apn-bounces@ietf.org> =B4=FA=B1=ED Yiannis Yiakoumis <yiannis@selfie= networks.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2020=C4=EA9=D4=C226=C8=D5 7:22
=CA=D5=BC=FE=C8=CB: Christian Huitema <huitema@huitema.net> =B3=AD=CB=CD: network-tokens@ietf.org <network-tokens@ietf.org>= ;; =B2=DC=B3=A9 <caoc15@chinaunicom.cn>; zhangs366@chinaunicom.cn <= ;zhangs366@chinaunicom.cn>; architecture-discuss@iab.org <architectur= e-discuss@iab.org>; apn <apn@ietf.org>; Lars Eggert <lars@egger= t.org>; pengshuping <pengshuping@huawei.com>
=D6=F7=CC=E2: Re: [Apn] [Network-tokens] [arch-d] Questions for APN:= Q#5

late in the discussion, but wanted to share some thoughts:<= br>

One of the first successful proof-points for SDN was Google claiming that they moved their WAN utilization to ~100%, instead= of over-provisioning. It saved them lots of money. Two of the design princ= iples that led them there were

i) moving from "all packets are equally important"= ; to "allocate resources based on application-level priorities" a= nd

ii) moving from "TCP flows regulated by "fair sha= re" mechanisms" to "measure demands, and shape flows at the = endpoints".

I can imagine offering low-latency SLA for 1% of the traffi= c (say video calls), is much cheaper and easier than doing this for all Int= ernet traffic (with the cost varying whether you are in Europe/US or an eme= rging market, rural or urban, a WISP, a low-orbit satellite network, etc). Could anyone from opera= tor-land comment on the economics of oversubscription/overprovision/SLAs in= the mobile world?

(btw: we already have SLAs today<= /span> --- VoLTE is IP traffic routed through dedicated radio and wire= d resources and has materially better network quality and reliability than = plain VoIP, and when you sign-up for a broadband connection you can get 10Mbps/100Mbps/1Gbps etc).

If over-provisioning wins (in 10 years) it will likely be t= he outcome of the network community's failure to find a good solution= for traffic differentiation, rather than a verdict that these use cases we= re not important enough.

FWIW: there are many issues to debate around fine-grained t= raffic differentiation beyond overprovisioning (like security, scalability,= privacy, net neutrality), and there are different approaches one could tak= e (APN and network tokens have different design principles and priorities on these trade-offs).

Best,

Yiannis

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D

Yiannis Yiakoumis

Co-Founder & CEO

https://selfienetworks.com | +1-650-644-7857

On Tue, Sep 22, 2020 at 8:29 AM, Christian Hui= tema <huitema@huitem= a.net> wrote:

On 9/21/2020 11:44 PM, Lars Eggert= wrote:

Hi,

On 2020-9-22, at 9:02, zhangs366@chinaunicom.cn wrote:

[Shuping] Again APN is aimed to wo= rk within a controlled and limited operators=A1=AF network domain not for I= nternet.

that significantly limits the attr= activeness of this proposal to application vendors. They can either buy int= o APN and ship an app that only works in some (initially, very few to none)= operator networks. Or, they can ship a slightly less optimal app that works on the entire Internet with its bil= lions of users.

More broadly, I'd like to point ou= t that during the entire history of the Internet there were application cla= sses that the deployed networks at the time were struggling to support. The= re were always claims that something like APN was needed, i.e, solutions that were intending to improve network= performance and quality but that were also adding significant complexity a= nd often required application changes.

Yes indeed. In the 90's the argume= nt was around video conferencing, which "obviously" could not wor= k on a plain best effort service. And then we got Skype.

What always happened so far was th= at Moore's law solved these problems, by improving the performance and qual= ity of the general Internet so that best effort was sufficient to support a= ll these "special" applications a few years down the road.

Yes. Indeed the whole history of w= ireless is driven by Moore's law. For example, the theory of MIMO has been = known for some time, put the application and the use of large number of inp= ut and output is only possible because of progress in electronics.

The same will happen with the use = cases presented to motivate the need for APN. The general Internet may stru= ggle to support them now, but in five years or so - which is about the time= horizon for any APN enablement of any operator network to happen - these will just work.

More bandwidth solves a lot of the= se issues. But we can also expect improvement in transport protocols and in= queue management. Active Queue Management techniques can isolate different= data streams and prevent stupid issues like "my daughter playing video games is degrading my VPN". New = congestion control protocols like BBR actively manage queuing delays, resul= ting in significantly lower latency overall. And then application just get = smarter in their use of caches, redundancy, gap filling, etc. All that is guaranteed to improve over time.

-- Christian Huitema

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"architecture-discuss@iab.org" , "network-tokens@ietf.org" Thread-Topic: Question List for APN: Q#9 & Q#10 Thread-Index: AdaW1eZKcQN8lq3gT3mGXusAXqpF7w== Date: Wed, 30 Sep 2020 03:08:00 +0000 Message-ID: <4278D47A901B3041A737953BAA078ADE19438DAE@dggeml512-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.153.195.37] Content-Type: multipart/alternative; boundary="_000_4278D47A901B3041A737953BAA078ADE19438DAEdggeml512mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Apn] Question List for APN: Q#9 & Q#10 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2020 03:08:19 -0000 --_000_4278D47A901B3041A737953BAA078ADE19438DAEdggeml512mbxchi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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X-MailScanner-ID: CF17961795C.A4A14 X-MailScanner: Found to be clean X-MailScanner-From: lars@eggert.org Archived-At: Subject: Re: [Apn] [Network-tokens] [arch-d] Questions for APN: Q#5 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2020 07:28:18 -0000 --Apple-Mail=_EA105A3E-4B70-4198-AA12-CD2BC8FAB7C7 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi, On 2020-9-26, at 2:22, Yiannis Yiakoumis = wrote: > One of the first successful proof-points for SDN was Google claiming = that they moved their WAN utilization to ~100%, instead of = over-provisioning. It saved them lots of money. Two of the design = principles that led them there were > i) moving from "all packets are equally important" to "allocate = resources based on application-level priorities" and > ii) moving from "TCP flows regulated by "fair share" mechanisms" to = "measure demands, and shape flows at the endpoints". I think these claims were made for Google's private B4 network, right? = AFAIK that is a *very* different network from the public Internet. =46rom = what I recall, each transfer over B4 is scheduled over the course of a = day based on various flow properties that are required to be specified, = following some giant minmax-like computation. > I can imagine offering low-latency SLA for 1% of the traffic (say = video calls), is much cheaper and easier than doing this for all = Internet traffic (with the cost varying whether you are in Europe/US or = an emerging market, rural or urban, a WISP, a low-orbit satellite = network, etc). Could anyone from operator-land comment on the economics = of oversubscription/overprovision/SLAs in the mobile world? Sure. But that could be done with existing mechanisms, like DSCP = marking. Remarking/bleaching does happen as traffic gets routed between = networks, but since the stated APN use case here is within an operator = network, that is under that operator's control. > (btw: we already have SLAs today --- VoLTE is IP traffic routed = through dedicated radio and wired resources and has materially better = network quality and reliability than plain VoIP, and when you sign-up = for a broadband connection you can get 10Mbps/100Mbps/1Gbps etc). Yup. And that happens without APN in the picture. > If over-provisioning wins (in 10 years) it will likely be the outcome = of the network community's failure to find a good solution for traffic = differentiation, rather than a verdict that these use cases were not = important enough. The problem isn't that we don't have good solutions for traffic = differentiation. We have tons. The problem is that none of the existing = ones have seen much deployment - but not because they don't work, = because of other issues. I don't see APN to offer materially = different/better deployment incentives than what we already have, and so = IMO it would share the same fate. Thanks, Lars > FWIW: there are many issues to debate around fine-grained traffic = differentiation beyond overprovisioning (like security, scalability, = privacy, net neutrality), and there are different approaches one could = take (APN and network tokens have different design principles and = priorities on these trade-offs). --Apple-Mail=_EA105A3E-4B70-4198-AA12-CD2BC8FAB7C7 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEmpq0ZpSoejRmyhheVLXDCb9wwVcFAl90M4EACgkQVLXDCb9w wVdUTA/+JIH4FecGMVKQl9GmYJkX+g2/78gZ++2qFlW7nJQUJTtyHkZ955YiXbta 1bjffuz9sFzraIV3idab5AN/f2BvQ/2uyJ2m+MBZL8FlsTqCeVQEAErbs6tFyz9Y Ah+ONEl69kOWei5Y6TJaONH2z0Rx6xgv6+JcPBNN6cjZRzr59X+JsJx3i+jfln+e Eva47krs+EHg/+OupcUT+wYgooaKOvESciUtTJHr3NhAj8NFCnivlRgeZepBZ4d7 mek9Sx8wM8+/UMXX4UowhsKFQeZLgmW+Xc5qdzSP65WBsOzvJr8mv01wLa2rfdag AFcBnI9V0aHfQU26fW3V6bSSUHPXpvV+MdWZLgZul7Cf/tRWassMCV7n2ioNroWf 45FPMHoSruVazi1hIEWE0vNntba/AIfl5U/yCrlvEqD0cIFyZaeYbFYLvosXCooF 0Y1NzBg9dfkQ05ch4BYhYD+Cii12b/o/kGRSWF5g1z7guheUeKzIo4DjmRM0uuB6 Ojee1D2EFKkTlILFhnsXbXtK7vs5Bnx4a2P7Jr440TzACpEXsFluYLk/0fs4GYBb t9l2gSOAQLsD0TbpwjJrz0GVm4fa6HNC//fqfPp8dlIdHHkGVznLMMKaNf0WSHkO mnQC+0RCWBozu/xsz7c36LExY0Iq+PEx/bMFHul/U/HDVJGWfVY= =QJmo -----END PGP SIGNATURE----- --Apple-Mail=_EA105A3E-4B70-4198-AA12-CD2BC8FAB7C7-- From nobody Wed Sep 30 11:07:59 2020 Return-Path: X-Original-To: apn@ietfa.amsl.com Delivered-To: apn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D29643A0A85 for ; Wed, 30 Sep 2020 11:07:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=selfienetworks-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9QFEXHSECG2h for ; Wed, 30 Sep 2020 11:07:48 -0700 (PDT) Received: from mail-vs1-xe2c.google.com (mail-vs1-xe2c.google.com [IPv6:2607:f8b0:4864:20::e2c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AFDFC3A0A86 for ; Wed, 30 Sep 2020 11:07:48 -0700 (PDT) Received: by mail-vs1-xe2c.google.com with SMTP id y194so1398162vsc.4 for ; Wed, 30 Sep 2020 11:07:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=selfienetworks-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:date:cc:references:from:message-id:subject :to; bh=VKQFduxcZiXuNElSMlGqWleVoisGSOSKJeCnUoW3IK8=; b=UuKcAMi7aanpdoyMfsyqgF82uTXVeWUD9BgTZg7wvDDTFPQby30UDTB3c0SnJwhSKE Joz7K8B5iSfNaFixdDRtnzQuM+NEtEzm4yvQKyteYf08IElc8g1gHHCw7AdoU6gHwJRA go//ZJx2afwK69Ka4eN8ix0F82PNnXc4SdyTZynZrR7YCFA0ZwXeOlPzwpkX15kmwHN2 Y8uzWkbZYsri13LLiQHd/DWpO8k7uOVwVhkfljb4wpxp/ujeF+QpY0lHJBjaN2UXYH6D 2SWjRJbwBxt37P4VUhy6t4P1f/7rVL/ea2W/2jrWog1l2dkxjKMUM+btFjo/Jr2EAdV9 +u0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:date:cc:references:from :message-id:subject:to; bh=VKQFduxcZiXuNElSMlGqWleVoisGSOSKJeCnUoW3IK8=; b=LwIWFGPTwxLyqzf/0XSXdCEGDdH6CCbPt/9mxu+yL3HE6tv4mTTBhZl/IHZ7EPCyhS GYULCbXNusIhdNRQeJVMZrypIF+8QgQS3F3yDtgOn+NavairBCrvgYKTsgwIpdx0MkWo EWTwcWiGNDvOa+umTOd7BgMKNdUxBWEoLc6PgzinpGoblVAO6RU2eyLOPSNEuHFFAGw+ mVfNSjDU+IWYfu1o2inntJwDj6wUBee2mPlHaUDWAyasEawaxq/zDQ9qG/4s7bm5HCgt WBuQFRa5ti3iprqvUeqmiosw0lsUsOFtMFrKmONWnck27lzfP9+vPBoNR2AN55vJG5Dj BHbA== X-Gm-Message-State: AOAM533JZsoNxEIbnx4ZXzTHsX3ZT8qf4esr+u1cJcQ7IDYD5bMCOjNU WUD9mPOA8wOsr8ofL8KwdOspYzc0DcibpQ== X-Google-Smtp-Source: ABdhPJwjSq5/v4XUeS81LnHNrvjZC1jwMRNO81MvdPe4xBa2tg+V6zmilalbOLWNSTu1T+DqrnuvEw== X-Received: by 2002:a67:e2c3:: with SMTP id i3mr2574527vsm.13.1601489267317; Wed, 30 Sep 2020 11:07:47 -0700 (PDT) Received: from localhost (0.92.231.35.bc.googleusercontent.com. [35.231.92.0]) by smtp.gmail.com with ESMTPSA id t15sm378220vso.27.2020.09.30.11.07.47 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Sep 2020 11:07:47 -0700 (PDT) Mime-Version: 1.0 X-Superhuman-Draft-ID: draft000eb7d5cd59bbec In-Reply-To: <121369D4-F4C7-44E9-9BFC-FA26A7265E98@eggert.org> Date: Wed, 30 Sep 2020 18:07:44 +0000 Cc: "Christian Huitema" , network-tokens@ietf.org, =?UTF-8?q?=E6=9B=B9=E7=95=85?= , zhangs366@chinaunicom.cn, architecture-discuss@iab.org, "apn" , "pengshuping" X-Mailer: Superhuman Desktop (2020-09-30T00:20:32Z) X-Superhuman-ID: kfppcgxt.1344815a-a208-41d0-a1ee-ca0f56521104 References: <2020092211271508522412@chinaunicom.cn> <4FEADB2A-A062-44B4-8D36-3651EBDD1ACD@eggert.org>

<121369D4-F4C7-44E9-9BFC-FA26A7265E98@eggert.org> From: "Yiannis Yiakoumis" Message-ID: To: "Lars Eggert" Content-Type: multipart/alternative; boundary=c41069d3cfd51ac41a275d48f4180cd75a29ee94966175a6f2c3995a6fde Archived-At: Subject: Re: [Apn] [Network-tokens] [arch-d] Questions for APN: Q#5 X-BeenThere: apn@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Application-aware Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Sep 2020 18:07:51 -0000 --c41069d3cfd51ac41a275d48f4180cd75a29ee94966175a6f2c3995a6fde Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Hi Lars, On Wed, Sep 30, 2020 at 12:28 AM, Lars Eggert < lars@eggert.org > wrote: >=20 >=20 >=20 > Hi, >=20 >=20 >=20 >=20 > On 2020-9-26, at 2:22, Yiannis Yiakoumis < yiannis@ selfienetworks. com ( > yiannis@selfienetworks.com ) > wrote: >=20 >=20 >=20 >>=20 >>=20 >> One of the first successful proof-points for SDN was Google claiming tha= t >> they moved their WAN utilization to ~100%, instead of over-provisioning. >> It saved them lots of money. Two of the design principles that led them >> there were >> i) moving from "all packets are equally important" to "allocate resource= s >> based on application-level priorities" and ii) moving from "TCP flows >> regulated by "fair share" mechanisms" to "measure demands, and shape flo= ws >> at the endpoints". >>=20 >>=20 >=20 >=20 >=20 > I think these claims were made for Google's private B4 network, right? > AFAIK that is a *very* different network from the public Internet. From > what I recall, each transfer over B4 is scheduled over the course of a da= y > based on various flow properties that are required to be specified, > following some giant minmax-like computation. >=20 >=20 >=20 >=20 Yes, this is for B4. While the network is different, the idea that you can = build a much more cost/performance efficient WAN still stands. >=20 >=20 >>=20 >>=20 >> I can imagine offering low-latency SLA for 1% of the traffic (say video >> calls), is much cheaper and easier than doing this for all Internet >> traffic (with the cost varying whether you are in Europe/US or an emergi= ng >> market, rural or urban, a WISP, a low-orbit satellite network, etc). Cou= ld >> anyone from operator-land comment on the economics of >> oversubscription/overprovision/SLAs in the mobile world? >>=20 >>=20 >>=20 >=20 >=20 >=20 > Sure. But that could be done with existing mechanisms, like DSCP marking. > Remarking/bleaching does happen as traffic gets routed between networks, > but since the stated APN use case here is within an operator network, tha= t > is under that operator's control. >=20 >=20 >=20 >=20 DSCP marking works within a single administrative domain where you have ful= l control of endpoints and the network. The moment you want to incorporate = end user devices and or third-party servers that sit out of the network, it= doesn't work well. My comments are not per APN usecases per se, but rather= the bigger traffic differentiation picture. (if I understand correctly, AP= N tries to limit things within an administrative domain to avoid having to = deal with trust, security, neutrality, etc). >=20 >=20 >>=20 >>=20 >> (btw: we already have SLAs today --- VoLTE is IP traffic routed through >> dedicated radio and wired resources and has materially better network >> quality and reliability than plain VoIP, and when you sign-up for a >> broadband connection you can get 10Mbps/100Mbps/1Gbps etc). >>=20 >>=20 >>=20 >=20 >=20 >=20 > Yup. And that happens without APN in the picture. >=20 >=20 >=20 >=20 This happens by having vertical integration for a specific use case (phone = app, phone driver, network control plane, network data plane ). I would rea= lly like to get VoLTE's reliability into my Zoom/FaceTime/WhatsApp calls, b= ut it is not possible. >=20 >=20 >>=20 >>=20 >> If over-provisioning wins (in 10 years) it will likely be the outcome of >> the network community's failure to find a good solution for traffic >> differentiation, rather than a verdict that these use cases were not >> important enough. >>=20 >>=20 >>=20 >=20 >=20 >=20 > The problem isn't that we don't have good solutions for traffic > differentiation. We have tons. The problem is that none of the existing > ones have seen much deployment - but not because they don't work, because > of other issues. I don't see APN to offer materially different/better > deployment incentives than what we already have, and so IMO it would shar= e > the same fate. >=20 >=20 >=20 >=20 I would disagree here. We do have several traffic differentiation deploymen= ts that use DPI and application signatures to map traffic into SLAs at a fi= ne granularity. It is largely inefficient cost and performance-wise, error-= prone, and violates privacy and neutrality in certain occasions. But that's= the one solution mostly used, for the lack of better alternatives. Best, Yiannis >=20 >=20 >=20 > Thanks, > Lars >=20 >=20 >>=20 >>=20 >> FWIW: there are many issues to debate around fine-grained traffic >> differentiation beyond overprovisioning (like security, scalability, >> privacy, net neutrality), and there are different approaches one could >> take (APN and network tokens have different design principles and >> priorities on these trade-offs). >>=20 >>=20 >>=20 >=20 >=20 > --c41069d3cfd51ac41a275d48f4180cd75a29ee94966175a6f2c3995a6fde Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8

Hi Lars,

On Wed, Sep 30, 2020 at 12:28 AM, Lars Eggert = <lars@eggert.org> wrote:

Hi,
On 2020-9-26, at 2:22, Yiannis Yiakoumis <yiannis@selfienetworks.com> wrote:
One of the first successful proof-points for SDN was Google claiming that t= hey moved their WAN utilization to ~100%, instead of over-provisioning. It = saved them lots of money. Two of the design principles that led them there = were
i) moving from "all packets are equally important" to "allocate= resources based on application-level priorities" and ii) moving from "TCP flows regulated by "fair share" mechanisms= " to "measure demands, and shape flows at the endpoints".
I think these claims were made for Google's private B4 network, right? = AFAIK that is a *very* different network from the public Internet. From wha= t I recall, each transfer over B4 is scheduled over the course of a day bas= ed on various flow properties that are required to be specified, following = some giant minmax-like computation.

Yes, this is for B4. While the network is different, the idea that you c= an build a much more cost/performance efficient WAN still stands.=C2=A0

I can imagine offering low-latency SLA for 1% of the traffic (say video cal= ls), is much cheaper and easier than doing this for all Internet traffic (w= ith the cost varying whether you are in Europe/US or an emerging market, ru= ral or urban, a WISP, a low-orbit satellite network, etc). Could anyone fro= m operator-land comment on the economics of oversubscription/overprovision/= SLAs in the mobile world?
Sure. But that could be done with existing mechanisms, like DSCP marking. R= emarking/bleaching does happen as traffic gets routed between networks, but= since the stated APN use case here is within an operator network, that is = under that operator's control.

DSCP marking works within a single administrative domain where you have = full control of endpoints and the network. The moment you want to incorpora= te end user devices and or third-party servers that sit out of the network,= it doesn't work well. My comments are not per APN usecases per se, but= rather the bigger traffic differentiation picture. (if I understand correc= tly, APN tries to limit things within an administrative domain to avoid hav= ing to deal with trust, security, neutrality, etc).=C2=A0

<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">

(btw: we already have SLAs today --- VoLTE i= s IP traffic routed through dedicated radio and wired resources and has mat= erially better network quality and reliability than plain VoIP, and when yo= u sign-up for a broadband connection you can get 10Mbps/100Mbps/1Gbps etc).

Yup. And that happens without APN in the picture.

This happens by having vertical integration for a specific use case (pho= ne app, phone driver, network control plane, network data plane ). I would = really like to get VoLTE's reliability into my Zoom/FaceTime/WhatsApp c= alls, but it is not possible.=C2=A0

If over-provisioning wins (in 10 years) it will likely be the outcome of th= e network community's failure to find a good solution for traffic diff= erentiation, rather than a verdict that these use cases were not important = enough.
The problem isn't that we don't have good solutions for traffic dif= ferentiation. We have tons. The problem is that none of the existing ones h= ave seen much deployment - but not because they don't work, because of = other issues. I don't see APN to offer materially different/better depl= oyment incentives than what we already have, and so IMO it would share the = same fate.

I would disagree here. We do have several traffic differentiation deploy= ments that use DPI and application signatures to map traffic into SLAs at a= fine granularity. It is largely inefficient cost and performance-wise, err= or-prone, and violates privacy and neutrality in certain occasions. But tha= t's the one solution mostly used, for the lack of better alternatives.= =C2=A0

Best,

Yiannis