nanog mailing list archives
Re: MTU problems with GRE tunnels (fwd)
From: brandon () rd bbc co uk (BrandonButterworth)
Date: Mon, 6 Jul 1998 17:38:00 +0100
# it seems that there is a small but significant # amount of application traffic out there that has problems when traversing a # GRE tunnel with MTU < 1500. We've seen two problems: # # - 1500 byte packets with DF set. This is either application traffic, or MTU # path discovery is broken, because the same packets get sent repeatedly
We see the same effect, if anyone wants a site to test against try one of ours - news.bbc.co.uk (193.130.149.130) This is a set of NT servers behind an RND Director, and we've found you never get past MTU discovery (though oddly if you go straight to an individual machine address, e.g. 193.130.149.131 it does work. The only client verified is IE4 on Win95. We were working on the NT stack as the probable cause (MTU black hole discovery defaults to off) Brandon
Current thread:
- MTU problems with GRE tunnels (fwd) Jens Schweikhardt (Jul 06)
- IpinIP tunnels - was Re: MTU problems with GRE tunnels (fwd) Paul Mansfield (Jul 06)
- Re: MTU problems with GRE tunnels (fwd) Alex P. Rudnev (Jul 06)
- Re: MTU problems with GRE tunnels (fwd) Dennis Ferguson (Jul 07)
- Re: MTU problems with GRE tunnels (fwd) Dave Thaler (Jul 09)
- Re: MTU problems with GRE tunnels (fwd) Jens Schweikhardt (Jul 09)
- Re: MTU problems with GRE tunnels (fwd) Dave Thaler (Jul 09)
- <Possible follow-ups>
- Re: MTU problems with GRE tunnels (fwd) BrandonButterworth (Jul 06)