Re: [alto] WGLC: draft-ietf-alto-protocol-11
Richard Alimi <rich@velvetsea.net> Mon, 02 July 2012 05:08 UTC
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From: Richard Alimi <rich@velvetsea.net>
Date: Sun, 01 Jul 2012 22:08:34 -0700
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To: Sabine Randriamasy <Sabine.Randriamasy@alcatel-lucent.com>
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Subject: Re: [alto] WGLC: draft-ietf-alto-protocol-11
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[ mistakenly dropped alto list from my reply...] On Sun, Jul 1, 2012 at 10:05 PM, Richard Alimi <rich@velvetsea.net> wrote: > On Mon, May 21, 2012 at 8:11 AM, Sabine Randriamasy > <Sabine.Randriamasy@alcatel-lucent.com> wrote: >> >> Hi Rich, >> >> >> Richard Alimi a écrit : >> >>> On Fri, May 11, 2012 at 11:15 AM, Sabine Randriamasy >>> <Sabine.Randriamasy@alcatel-lucent.com> wrote: >>> >>>> >>>> Hi all, >>>> >>>> Below is my review of document "draft-ietf-alto-protocol-11.txt". At >>>> least >>>> Part I, until section 7.7.3.1.5 included. I will send Part II in a couple >>>> of >>>> hours. >>>> >>>> Thanks, >>>> Sabine >>>> >>>> >>>> =============================================================================================== >>>> >>>> >>>> Document: draft-ietf-alto-protocol-11.txt >>>> Title: ALTO Protocol >>>> Reviewer: Sabine Randriamasy >>>> Review Date: May 11, 2012 >>>> Part I >>>> >>>> ----------------------------------------------------- >>>> GENERAL COMMENTS >>>> ----------------------------------------------------- >>>> >>>> This document seems geared towards P2P applications, although the >>>> abstract >>>> mentions CDN and "those that have a choice in connection endpoints". In >>>> some >>>> places, see detailed comments, "peer" should be replaced by "endpoints" >>>> when >>>> referring to a content location. In Section 8 Use Cases, some text should >>>> be >>>> added to recall this. >>>> >>> >>> >>> Yes - that sounds reasonable. We'll do a search for the word 'peer' >>> to see if a better term can be used, and also add a reminder in the >>> use cases that P2P is not the only deployment setting. >>> >>> >>>> >>>> There was a discussion on whether to specify the MUST of the protocol. Is >>>> it >>>> possible to have a section listing the MUST of the protocol specified in >>>> this document? >>>> >>> >>> >>> I don't recall this discussion - do you have a pointer? >>> >>> If I'm understanding the proposal correctly, I am concerned about how >>> much duplicate information that would generate. Is there an example >>> RFC you could reference that does this? >>> >> >> I remember there was a discussion on the list and also in Quebec that was on >> specifying the features that the ALTO MUST have. My question here was rather >> on the possibility listing the MUST identified in the doc. I don't have any >> reference of RFC doing this and as it may generate duplicate information >> then it seems preferable not to do it. > > Given the concern over a large amount of duplicate text in the draft, > I'd like to leave such a list out unless there are others in the WG > that feel strongly that we should have it. > >> >>> >>>> >>>> ----------------------------------------------------- >>>> DETAILED COMMENTS >>>> ----------------------------------------------------- >>>> >>>> Section 1.1 Background and Problem Statement >>>> >>>> A couple of additional explanations would help better positioning and >>>> motivating ALTO. For example: >>>> >>>> - § 1 after 1st sentence "Today, network information available to >>>> applications is mostly from >>>> the view of endhosts.": I suggest to add 1 or 2 sentences on what is >>>> wrong >>>> with this, e.g. the fact that overlay based endpoint choice leads to >>>> uselessly use expensive links and lower performance due to too long >>>> paths. >>>> >>> >>> >>> We can add something there. A better way to phrase this might be that >>> a view only from the view of the endhosts makes it >>> difficult/impossible to be aware of policies or properties of the >>> overall network topology. >>> >> >> Yes, thanks >> >>> >>>> >>>> - §1, 2nd sentence "There is no clear mechanism to convey information >>>> about >>>> the network (e.g., preferences) to applications": could be specified by >>>> saying that some sparse tools may exist but there is a need to have a >>>> generic and standardized mechanism accessible to all. >>>> >>> >>> >>> Just to be sure I understand, which specific tools were you thinking >>> about here? BGP looking glasses or whois? Or others? >>> >> >> I'd say both and other related such as *ClosestNode.com or others examples >> you may have in mind. > > I think we can expand this sentence to mention some existing examples. > As far as arguing that there needs to be a standardized mechanism, I > think the Problem Statement document should do that already. > >> >> * >>> >>> >>>> >>>> - §2last sentence "The mechanism should include abstractions to achieve >>>> concise, flexible network information expression.": is it the only >>>> motivation for abstraction or does abstraction also serve other purposes >>>> such as security/privacy for ISPs? >>>> >>> >>> >>> I would tend to keep the security/privacy issue out of the >>> introduction when we are motivating the protocol. These are >>> requirements that should (I believe, anyways) already be handled in >>> the Discussion section of this document and in the requirements >>> document. >>> >> >> Ok >> >>> >>>> >>>> Section 1.3.1 Service Providers >>>> This section is hard to understand without a hint on what kind of >>>> information is provided by ALTO. I suggest to add a sentence including >>>> abstracted network maps, asociated costs between the locations of the map >>>> or >>>> specific properties or access costs to these locations. >>>> >>> >>> >>> I'll see what we can do to add a small hint in here without going into >>> detail. >>> >> >> Sure. It's just that 2 or 3 lines with basic Alto services would make the >> reading more comfortable. >> >>> >>>> >>>> - in 1st sentence: "... the peer selection process ... " ==> "peer" shoud >>>> be >>>> replaced by "connection endpoints such as peers" >>>> >>> >>> >>> Ack. >>> >>> >>>> >>>> Section 2.1 Terminology >>>> >>>> - in §2: the term "Endpoint" should be added >>>> - a first section "2.1.X Endpoint" should be inserted before section >>>> 2.1.1 >>>> Endpoint Address to better introduce Endpoint Adress and Network Location >>>> mentioning "Endpoint" with no prior definition. >>>> >>> >>> >>> Ack - we'll add this. >>> >>> >>>> >>>> Section 2.2 ALTO Service and Protocol Scope >>>> - §3 "... The ALTO Information provided by the ALTO Server can be updated >>>> dynamically based on network conditions ...": a sentence would be good >>>> here >>>> to recall that ALTO does by no means replace real time network >>>> performance >>>> measurement services. >>>> >>> >>> >>> Do you instead mean ~real-time congestion control protocols? If so, >>> we can add a reminder. >>> >> >> yes, sorry for the confusing phrasing. >> >>> >>>> >>>> Section 3 Protocol Structure >>>> - §3 3rd sentence "ALTO-Core provides the Map Service, which provides the >>>> core ALTO informtion to >>>> clients". The term "ALTO-Core" should be introduced ans besides it does >>>> not >>>> appear again in the document. >>>> >>> >>> >>> Actually, I think the term can just be dropped at this point. (Let me >>> know if anyone disagrees) >>> >> >> Ok >> >>> >>>> >>>> Also replace "informtion" ==> "information". >>>> >>> >>> >>> Ack. >>> >>> >>>> >>>> Section 4 Network Map >>>> - §2: "The Network Location endpoint property": i suggest "The Network >>>> Location Endpoint Property" >>>> >>>> >>>> Section 7.2.1 Discovering Information Resources >>>> - §1 "To discover available resources, an ALTO Client may request the >>>> Information Resource Directory": what are other means? There seem to be a >>>> contradiction with Section 6.2 Protocol design where item "o Information >>>> Resource Directory" says that "This directory is the single entry point >>>> to >>>> an ALTO Service." >>>> >>> >>> >>> Does changing it from >>> "an ALTO Client may request ... " >>> to >>> "an ALTO Client requests... " >>> clear this up? >>> >> >> yes >> >>> >>>> >>>> Section 7.2.7 Parsing >>>> - last sentence "ALTO implementations MUST ignore...": i suggest an >>>> insertion: "base protocol ALTO implementations MUST ignore...", or if it >>>> has >>>> been previously defined, the term "ALTO-core" could be used here. >>>> >>> >>> >>> The advice is common to any ALTO implementation, even one that is >>> supporting an extension. If an implementation is supporting an >>> extension, then those fields are no longer "unknown". >>> >> >> Ok >> >>> If that still isn't clear, do you have an alternate suggestion on the >>> wording? >>> >> >> We can leave the initial sentence >> >>> >>>> >>>> Section 7.4 ALTO Errors >>>> - §3 2nd sentence: "... information about the why a particular ...": i >>>> suggest to remove "the" => "... information about why a particular ..." >>>> >>> >>> >>> Ack - thanks. >>> >>> >>>> >>>> Section 7.4.1 Media Type >>>> "... The media type for an Error Resource ...": does it mean "The media >>>> type >>>> for an ALTO Error Resource" ? >>>> >>>> >>> >>> >>> Yes - we'll make that more precise. >>> >>> >>>> >>>> Section 7.4.2 >>>> - 1st sentence "An Error Resource has the format:": is the answer to my >>>> previous question is yes, then "An ALTO ALTO Error Resource has the >>>> format:" >>>> reads easier. >>>> >>>> >>> >>> >>> Ack - I'll just avoid the extra 'ALTO' when updating the text :) >>> >> >> Ok :-) >> >>> >>>> >>>> Section 7.4.3 Error Codes >>>> - §2 last sentence: "... Table 1in the HTTP response." : blank space is >>>> needed after "1" ==> "... Table 1 in the HTTP response." >>>> >>>> >>> >>> >>> Ack. >>> >>> >>>> >>>> Section 7.6.2 Encoding >>>> - §3 1st sentence "Any URI ... the format of an Information Resource >>>> Directory.": i suggest to append "request" ==> "Any URI ... the format of >>>> an >>>> Information Resource Directory request." >>>> >>> >>> >>> Ack. >>> >>> >>>> >>>> - §4 - item "capabilities": i didin't understand the sentence "or assume >>>> its >>>> default value", although the protocol is not expected to guide the ALTO >>>> Client's behavior. >>>> >>> >>> >>> Each capability should have a default value documented in this >>> specification - the text here is only indicating that the client >>> should fall back to that value. Does that answer the question? >>> >> >> Yes. Then how about saying "or assume its default value that SHOULD be >> documented in this specification" > > That sounds fine, but I'll just rephrase to say "or assume its default > value which is documented in this specification." I don't think > normative language is needed there, since the instruction applies to > the document authors/editors/WG and not the implementers. > >> >>> Note to self: "empty array" -> "empty object" in this paragraph >>> >>> >>>> >>>> Section 7.6.3 Example >>>> >>>> In the first IRD example the last URI called >>>> "http://alto.example.com/endpointcost/lookup" includes the following >>>> capabilities: >>>> >>>> "cost-modes" : [ "ordinal", "numerical" ], >>>> "cost-types" : [ "routingcost", "hopcount" ] >>>> >>>> In the second example listing URIs available in a subdomain, we have the >>>> same capabilities for the URI called >>>> "http://custom.alto.example.com/costmap/filtered" >>>> >>>> There is a need for the ALTO Server to disambiguate this encoding. As an >>>> ALTO client, I don't know how to figure what Cost Mode is applied >>>> respectively to the Cost Type "routingcost" and "hopcount". Is it both >>>> modes >>>> for each cost type? >>>> >>>> >>>> Also, as a server, how do I encode that for example "routingcost" is >>>> available in both "ordinal" and "numerical" modes and "hopcount" in >>>> "numerical" only? I guess separate URIs would be the way... >>>> >>> >>> >>> Section 7.7.1.2.4. says: >>> An ALTO Server MUST support all of the Cost Types listed here for >>> each of the listed Cost Modes. Note that an ALTO Server may provide >>> multiple Cost Map Information Resources, each with different >>> capabilities. >>> >>> Does that answer both questions? >>> >> >> If the conclusion of this text for the example IRD is that 'routingcost' and >> 'hopcount' are each available for both 'numerical' and 'ordinal' mode, then, >> as § 7.7.1.2.4 comes after the IRD example, I think that things would be >> completely clear if § 7.6.3 would include an illustrative sentence like, "In >> this example, the ALTO server provides the Endpoint Cost Service for Cost >> Types 'routingcost' and 'hopcount', each available for both 'numerical' and >> 'ordinal' mode". > > That sounds fine to me. We'll add a hint here. > >> As for my 2nd question, I understand that for the mentionned case, the IRD >> then must include 2 URIs: one for 'routingcost' and the other for >> 'hopcount'. >> >>> >>>> >>>> Section 7.7.1.2.4 Capabilities >>>> >>>> - Object CostMapCapability has member "CostType cost-types<0..*>;". the >>>> description says: "If not present, this member MUST be interpreted as an >>>> empty array." On the other hand, Section 7.7.1.2 Cost Map in its §1 says >>>> "This resource MUST be provided for at least the ’routingcost’ Cost Type >>>> and >>>> ’numerical’ Cost Mode." >>>> So would "CostType cost-types<1..*>" be more consistent? >>>> Likewise, as the 'numerical' mode MUST be available, why not have >>>> CostMode >>>> cost-modes<1..*> ? >>>> >>> >>> >>> There are valid cases for them being empty. Specifically, this can >>> happen if the server generating the Information Resource Directory is >>> not authoritative as to what capabilities are supported. See 7.6.3 >>> for an example. >>> >> >> Ok >> >>> Each cost-map endpoint need not support the routingcost type - an ALTO >>> Service must do so. >>> >> >> Ok >> >>> >>>> >>>> See also §7.7.3.1.3 Input Parameters, where encoding "EndpointProperty >>>> properties<1..*>" is used, because 'pid' MUST be available. >>>> >>> >>> >>> Do you mean "EndpointProperty prop-types<0..*>;" instead? >>> >> >> Yes, the error is on my side, there was a confusion with §7.7.3.1.4 >> Capabilities. >> >>> This has a similar reasoning to the above for cost maps. >>> >> >> Ok >> >>> >>>> >>>> Section 7.7.2.2.3 Input Parameters >>>> - item "constraints" use term "numerical cost". Onthe other hand, Section >>>> 7.7.2.4.4 Capabilities in its item "cost-constraints" says (last >>>> sentence) >>>> "... constraints may not have the intended effect for cost maps with the >>>> ’ordinal’ Cost Mode... ". >>>> Although it intuitively make more sens to have constraints on numerical >>>> values, one may imagine that for some reasons an application clien may >>>> look >>>> for alternative paths that have a poorer rank but not worse that a given >>>> value and accordingly encode a constraint on 'ordinal' costs. >>>> Therefore, I suggest to use term "cost value" instead of "numerical >>>> cost". >>>> >>> >>> >>> Agree. that should not explicitly mention numerical costs in the >>> documentation for constraints. Good catch. >>> >>> >>>> >>>> Section 7.7.3.1.3 Input Parameters >>>> - §1 2nd sentence: "... data format of input parameteres...": typo ==> >>>> "... >>>> data format of input parameters..." >>>> - item "properties": "List of endpoint properties to returned... " i >>>> suggest >>>> "List of endpoint properties to be returned... ". >>>> >>> >>> >>> Ack. >>> >>> >>>> >>>> I also suggest to add that >>>> property 'pid' MUST be provided. >>>> >>> >>> >>> That is already noted in 7.7.3.1 right? Note that a particular URI >>> need not provide the 'pid' property - the ALTO Service as a whole >>> needs to do so. >>> >>> This seems worth clarifying - I'll add a note to do that. >>> >> >> Thanks >> >>> >>>> >>>> Section 7.7.3.1.4 Capabilities >>>> - object "EndpointPropertyCapability;" has a member "EndpointProperty >>>> prop-types<0..*>". As 'pid' MUST be provided why not encode as >>>> "EndpointProperty prop-types<1..*>" ? >>>> >>> >>> >>> Same as the response above, I believe. >>> >> >> Yes, again, my confusion. >> >>> >>>> >>>> ----------------------------------------------------- >>>> NITS >>>> ----------------------------------------------------- >>>> >>>> Abstract >>>> - §3: ".... be provided by the network ..." => I suggest ".... be >>>> provided >>>> by the network operator ..." or any applicable term >>>> >>>> >>>> Section 1.1 Background and Problem Statement >>>> - 2nd sentence "... about the network ..." => I suggest "... about the >>>> network infrastructure ..." >>>> >>>> >>>> Section 2.1 Terminology >>>> - the typography should be harmonized between "endpoint address" and >>>> "Endpoint Address". >>>> >>>> Section 2.2 ALTO Service and Protocol Scope >>>> >>>> - §1 last sentence: "... deployment scenario and discovery mechanism ..." >>>> ==> I suggest to complete as follows "... ALTO deployment scenario and >>>> ALTO >>>> service discovery mechanism ..." >>>> - §2 1st sentence: "... the overall system architecture ..." ==> I >>>> suggest >>>> "the overall ALTO system architecture" >>>> - §4 last sentence: "... figure for completeness but outside ..." ==> I >>>> suggest "... figure for completeness but are outside ..." >>>> >>>> >>>> Section 3 Protocol Structure >>>> - §3: i suggest to replace "functionality" by "functionalities" >>>> >>>> >>>> Section 3.1.1 Map Service >>>> - §1: replace "endpoints" by "Endpoints" >>>> >>>> >>>> Section 7.4 ALTO Errors >>>> - §3 2nd sentence: "... information about the why a particular ...": i >>>> suggest to remove "the" => "... information about why a particular ..." >>>> >>>> >>> >>> >>> Ack. >>> >>> Thanks! >>> Rich >>> >>> >>>> >>>> Enrico Marocco a écrit : >>>> >>>> >>>>> >>>>> The chairs would like to declare a Working Group Last Call for >>>>> draft-ietf-alto-protocol-11, ending Friday May 11th. >>>>> >>>>> Please do review the latest version of the draft, and send any comments >>>>> to the list before the expiry of WGLC so we can get this document ready >>>>> for the IESG. >>>>> >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> alto mailing list >>>> alto@ietf.org >>>> https://www.ietf.org/mailman/listinfo/alto >>>> >> >>
- [alto] WGLC: draft-ietf-alto-protocol-11 Enrico Marocco
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Songhaibin
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Martin Stiemerling
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 David Harrington
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Sabine Randriamasy
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 - Pa… Sabine Randriamasy
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Richard Alimi
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 - Pa… Richard Alimi
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Richard Alimi
- [alto] alto-protocol-11 vs. alto-reqs-14 Sebastian Kiesel
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Songhaibin
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Richard Alimi
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Songhaibin
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Sabine Randriamasy
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 - Pa… Sabine Randriamasy
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Richard Alimi
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Richard Alimi
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Martin Stiemerling
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Martin Stiemerling
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Sabine Randriamasy
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Sebastian Kiesel
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Sebastian Kiesel
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Richard Alimi
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Richard Alimi
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Richard Alimi
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Sebastian Kiesel
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Y. Richard Yang
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Sabine Randriamasy
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Martin Stiemerling
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Martin Stiemerling
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Martin Stiemerling
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Richard Alimi
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Richard Alimi
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Ben Niven-Jenkins
- Re: [alto] alto-protocol-11 vs. alto-reqs-14 Richard Alimi
- Re: [alto] WGLC: draft-ietf-alto-protocol-11 Y. Richard Yang