On Jun 26, 2013, at 4:52 PM, Fernando Gont <[email protected]> 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: [email protected] || [email protected] > PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1 > > > > > -- > Fernando Gont > SI6 Networks > e-mail: [email protected] > PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 > > > > ----------------------------------- "We are learning to do a great many clever things...The next great task will be to learn not to do them." - G. K. Chesterton (1874-1936) -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
