nanog mailing list archives
Re: Comcast enables 6to4 relays
From: Jack Bates <jbates () brightok net>
Date: Mon, 30 Aug 2010 17:45:28 -0500
Others may correct me, but... Franck Martin wrote:
5 2002:7114:4a9d::1 274.299 ms [mtu: 1480] 6 2002:7114:4a9d:0:xxxxxxxx 299.939 ms [*mtu: 1422] So I suspect on return path I use a HE.Net relay?
Yes, and it appears that your host is replying back to the office.
And yes I agree it is such a PITA to troubleshoot, I cannot pinpoint the issue. Nor I cannot see if I'm the only one with this kind of troubles, I suspect most just give up immediately...
Given that you seem to complete the trace one direction, but not the other, I can think of 2 things,
1) Your originating host may be breaking PMTU (so the packet you send is too large and doesn't make it, you never resend a smaller packet, but it works when tracerouting from the other side due to PMTU working in that direction and you are responding with the same size packet).
2) If hosts in the middle on your traceroute to the destination don't have access to 6to4 relay, they won't be able to reply back to you, so you may end up with timeout hops before getting to the endpoint.
Jack
Current thread:
- Re: Comcast enables 6to4 relays, (continued)
- Re: Comcast enables 6to4 relays Franck Martin (Aug 30)
- Re: Comcast enables 6to4 relays Franck Martin (Aug 30)
- Re: Comcast enables 6to4 relays Leo Bicknell (Aug 30)
- Re: Comcast enables 6to4 relays John Jason Brzozowski (Aug 30)
- Re: Comcast enables 6to4 relays Franck Martin (Aug 30)
- Re: Comcast enables 6to4 relays Graham Beneke (Aug 30)
- Re: Comcast enables 6to4 relays Jack Bates (Aug 30)
- Re: Comcast enables 6to4 relays Franck Martin (Aug 30)
- Re: Comcast enables 6to4 relays Jack Bates (Aug 30)
- Re: Comcast enables 6to4 relays Franck Martin (Aug 30)
- Re: Comcast enables 6to4 relays Jack Bates (Aug 30)
- Re: Comcast enables 6to4 relays John Jason Brzozowski (Aug 30)
- Re: Comcast enables 6to4 relays Franck Martin (Aug 29)
- Re: Comcast enables 6to4 relays John Jason Brzozowski (Aug 29)
- Re: Comcast enables 6to4 relays John Jason Brzozowski (Aug 30)
- Re: Comcast enables 6to4 relays Jack Bates (Aug 30)
- Re: Comcast enables 6to4 relays Cameron Byrne (Aug 30)
- Re: Comcast enables 6to4 relays Mikael Abrahamsson (Aug 30)
- UPDATED - Comcast enables 6to4 relays John Jason Brzozowski (Aug 30)