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Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt

"Fred Baker (fred)" <fred@cisco.com> Thu, 27 June 2013 04:14 UTC

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From: "Fred Baker (fred)" <fred@cisco.com>
To: Fernando Gont <fgont@si6networks.com>
Subject: Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
Thread-Topic: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
Thread-Index: AQHOcdXNVc9Jzi6cikCUApHj4sRJiJlHKFIAgACCt4CAAHzRgIAA2MuAgABJMwA=
Date: Thu, 27 Jun 2013 04:14:43 +0000
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On Jun 26, 2013, at 4:52 PM, Fernando Gont <fgont@si6networks.com>
 wrote:

> On 06/26/2013 12:56 PM, Mark ZZZ Smith wrote:
>> 
>> One of the issues with conventional ICMP PTB based PMTUD is the
>> default rate limits on ICMP messages on broadband routers with PPPoE
>> subscribers i.e. dumbell [1500][1492][1500] MTUs, slowing down PMTUD.
>> Upping the limit on ICMP PTBs is an obscure parameter to have to
>> remember to change, and it isn't clear exactly what to change it to -
>> IIRC, the value I've used in the past is 1000/s up from 10/s. RFC4821
>> would be nice because it would avoid control plane processing that
>> ICMP based PMTUD causes.
> 
> Many implementers don't want to rely on a 100% ICMP-less PMTUD because
> of the potentially-lng convergence time (i.e. time to discover the PMTU).

And when ICMP is blocked, and the convergence interval is infinite...?

> Thanks,
> -- 
> Fernando Gont
> e-mail: fernando@gont.com.ar || fgont@si6networks.com
> PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1
> 
> 
> 
> 
> -- 
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> 
> 
> 
> 

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