Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem WGLC
joel jaeggli <joelja@bogus.com> Wed, 10 June 2015 05:44 UTC
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To: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>, Brian E Carpenter <brian.e.carpenter@gmail.com>, "v6ops@ietf.org" <v6ops@ietf.org>
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From: joel jaeggli <joelja@bogus.com>
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Subject: Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem WGLC
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On 6/9/15 3:09 AM, Mark ZZZ Smith wrote: > > > > > ________________________________ > From: joel jaeggli <joelja@bogus.com> > To: Brian E Carpenter <brian.e.carpenter@gmail.com>; v6ops@ietf.org > Sent: Monday, 8 June 2015, 5:02 > Subject: Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem WGLC > > > On 5/31/15 4:45 PM, Brian E Carpenter wrote: >> Hi, >> >> Generally I think this is useful and almost ready. >> >>> 3.1. Alternatives >>> >>> As an alternative, it may be appropriate to lower the TCP MSS to 1220 >>> in order to accommodate 1280 byte MTU. We consider this undesirable >>> as hosts may not be able to independently set TCP MSS by address- >>> family thereby impacting IPv4, or alternatively that it relies on a >>> middle-box to clamp the MSS independently from the end-systems. >> >> The "that" in the second sentence doesn't parse. I don't understand >> what the draft is trying to say about MSS clamping. > > Is this better? > > or alternatively that middle-boxes need to be employed to clamp the MSS > > independently from the end-systems. > > / I think it is also necessary to point out that the 1220 MSS value doesn't allow for any EHs if the packet size is limited / being limited to 1280. Middle boxes should also be taking into account the present EHs if they adjust the TCP MSS. It's worth noting i suppose, as a potential contributor to mtu size issues I think we can do that. if you send extension header containing packets or fragments to my servers, pmtud is maybe isn't the biggest problem because they'll never arrive. :/ >> Also, shouldn't we say "undesirable but possibly necessary in some >> cases"? A server at the mercy of an ISP might *need* to apply MSS clamping. > > since we are dealing with alternative mitigations we are justifying why > we don't like them, I thin they can be employed. > >> Nit: >> >> It's confusing to have these two sections with identical titles: >> >>> 3.1. Alternatives >>> 3.2.1. Alternatives >> >> Maybe 3.1 should be "MSS-based Alternatives" >> and 3.2.1 "Distributed Proxy Alternatives" > > nice. > > thanks > > > > >> Brian >> On 01/06/2015 06:00, fred@cisco.com wrote: >>> This is to initiate a two week working group last call of >>> http://tools.ietf.org/html/draft-ietf-v6ops-pmtud-ecmp-problem. >>> Please read it now. If you find nits (spelling errors, minor suggested >>> wording changes, etc), comment to the authors; if you find greater >>> issues, such as disagreeing with a statement or finding additional >>> issues that need to be addressed, please post your comments to the >>> list. >>> >>> We are looking specifically for comments on the importance of the >>> document as well as its content. If you have read the document and >>> believe it to be of operational utility, that is also an important >>> comment to make. >>> >>> _______________________________________________ >>> v6ops mailing list >>> v6ops@ietf.org >>> https://www.ietf.org/mailman/listinfo/v6ops >>> >> >> _______________________________________________ >> v6ops mailing list >> v6ops@ietf.org >> https://www.ietf.org/mailman/listinfo/v6ops >> > > > > _______________________________________________ > v6ops mailing list > v6ops@ietf.org > https://www.ietf.org/mailman/listinfo/v6ops >
- [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem WGLC fred
- Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem W… Brian E Carpenter
- [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem WGLC fred
- Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem W… joel jaeggli
- Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem W… Brian E Carpenter
- Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem W… Mark ZZZ Smith
- Re: [v6ops] draft-ietf-v6ops-pmtud-ecmp-problem W… joel jaeggli