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Re: Use cases for PMTUD and PLPMTUD (was: RE: 6MAN: Adoption call on draft-hinden-6man-rfc1981bis-01)

Fernando Gont <fernando@gont.com.ar> Fri, 05 February 2016 20:18 UTC

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Subject: Re: Use cases for PMTUD and PLPMTUD (was: RE: 6MAN: Adoption call on draft-hinden-6man-rfc1981bis-01)
To: Michael Richardson <mcr+ietf@sandelman.ca>, "Templin, Fred L" <Fred.L.Templin@boeing.com>
References: <2134F8430051B64F815C691A62D983183395EFC6@XCH-BLV-105.nw.nos.boeing.com> <7592.1454699773@obiwan.sandelman.ca>
From: Fernando Gont <fernando@gont.com.ar>
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Date: Fri, 05 Feb 2016 17:18:28 -0300
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Cc: Bob Hinden <bob.hinden@gmail.com>, 6man WG <ipv6@ietf.org>, "Fred Baker (fred)" <fred@cisco.com>
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On 02/05/2016 04:16 PM, Michael Richardson wrote:
> 
> Templin, Fred L <Fred.L.Templin@boeing.com> wrote:
>     > On the other hand, paths that lead to Internet destinations cannot be
>     > counted on to deliver the necessary ICMPs. In that case, RFC4821
>     > provides a mitigation.
> 
>     > But, if we do not believe that there are paths for which traditional
>     > PMTUD can still be used safely, then we should be working to deprecate
>     > RFC1981 instead of making it a standard.
> 
> I think that the mitigation is far more reliable than 1981.
> So, I'd rather deprecate RFC1981.
> 
> {I noticed that 4821 is not on by default in most Linux distros/kernels,
> and I actually want to know if there is some reason for it}

Yes: convergence time.

-- 
Fernando Gont
e-mail: fernando@gont.com.ar || fgont@si6networks.com
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1

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