nanog mailing list archives
IPv6 PMTUD and OS-X
From: Franck Martin <franck () genius com>
Date: Sat, 21 Aug 2010 09:27:03 +1200 (FJT)
I'm trying to debug a pesky PMTUD issue with IPv6 on Mac OS-X 10.6. It happens only from home, on wireless, when connected to a mac aiport that does an automatic tunnel (teredo) to IPv6 backbone. There are IPv6 web site that I cannot browse until I lower the MTU to 1400. My Linux desktop in similar config works fine... With tracepath6, I see one end of the tunnel tells me MTU should be 1280, that's using linux tools. On mac, tracepath6 does not seem to exist, and I don't know what tool to use... I have seen scamper, but no binary... I have used wireshark (on mac) to detect the PTB packet, but don't see it either... I have not compared with my linux box... I'm doing this testing on the side, slowly because it is fun to try to understand what's wrong here... and I wonder if others have had similar issues... May be not fully on topic, but to bring it back to topic see this presentation: http://www.ripe.net/ripe/meetings/ripe-60/presentations/Stasiewicz-Measurements_of_IPv6_Path_MTU_Discovery_Behaviour.pdf Which states the PMTUD failure rate on IPv6 is about 1.9%
Current thread:
- IPv6 PMTUD and OS-X Franck Martin (Aug 20)
- Re: IPv6 PMTUD and OS-X Jeroen Massar (Aug 20)
- Re: IPv6 PMTUD and OS-X Franck Martin (Aug 20)
- Re: IPv6 PMTUD and OS-X bmanning (Aug 21)
- Re: IPv6 PMTUD and OS-X Jeroen Massar (Aug 21)
- <Possible follow-ups>
- Re: IPv6 PMTUD and OS-X Vyto Grigaliunas (Aug 24)
- Re: IPv6 PMTUD and OS-X Jeroen Massar (Aug 20)