nanog mailing list archives
Re: v6 cdn problems
From: Jeroen Massar <jeroen () massar ch>
Date: Mon, 10 Nov 2014 09:17:08 +0100
On 2014-11-10 09:10, Christopher Morrow wrote:
On Mon, Nov 10, 2014 at 12:51 AM, Jeroen Massar <jeroen () massar ch> wrote:There used to be a handy ipv6@google address for reporting things. This nowadays bounces.yes, it changed to noc@ I think.
Thus, in case of an IPv6 issue, contacting noc () google com is the right thing to do? Good to hear that the folks there are aware of IPv6.
and yup, damian (and a few other folk) beat the mtu issue with a cold trout.
Thanks for that.
From a message by Lorenzo:
http://lists.cluenet.de/pipermail/ipv6-ops/2014-November/010278.html it seems Google is breaking PMTUD on purpose preferring to force the MSS to a minimum value instead. But the problem there is not PMTUD, but what is described in: https://tools.ietf.org/html/draft-v6ops-jaeggli-pmtud-ecmp-problem-01 Which makes sense on a Google-scale of connections. I am not sure that breaking PTMUD and forcing MSS is the correct answer though. Forcing MSS is likely a good intermediary step, actually fixing the load-balancer is a better one though. I am now wondering if that is what is hitting Akamai too, as that would explain the problem being seen: contacting the same IP sometimes works and sometimes does not; which could be a result of the real endnode not always seeing the correct ICMP and thus knowing the correct MTU. Greets, Jeroen
Current thread:
- v6 cdn problems Pete Carah (Nov 08)
- Re: v6 cdn problems Hugo Slabbert (Nov 08)
- RE: v6 cdn problems Frank Bulk (Nov 08)
- Re: v6 cdn problems joel jaeggli (Nov 09)
- Re: v6 cdn problems Jeroen Massar (Nov 08)
- Re: v6 cdn problems Pete Carah (Nov 08)
- Re: v6 cdn problems Pete Carah (Nov 08)
- Re: v6 cdn problems Christopher Morrow (Nov 09)
- Re: v6 cdn problems Jeroen Massar (Nov 09)
- Re: v6 cdn problems Christopher Morrow (Nov 10)
- Re: v6 cdn problems Jeroen Massar (Nov 10)