Date: Fri, 15 May 2009 08:38:43 -0400 From: Steve Bertrand <steve@ibctech.ca> To: Kevin Oberman <oberman@es.net> Cc: freebsd-net@freebsd.org Subject: Re: IPv6 fragmentation weirdness Message-ID: <4A0D6253.7080509@ibctech.ca> In-Reply-To: <20090514214235.B09701CC12@ptavv.es.net> References: <20090514214235.B09701CC12@ptavv.es.net>
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[-- Attachment #1 --]
Kevin Oberman wrote:
> Second, why the heck is the fragment going out first? This should be OK,
> but I suspect many firewalls (which are often not happy with fragments)
> are not likely to pass a fragment which precedes the initial frame.
I'll try to find some time today to see if I can replicate this issue.
I've never noticed it, mind you, I haven't been looking.
> Can anyone fetch anything from ftp.funet.fi via IPv6? I suspect it is
> something in the path that is blocking my traffic, so others may not see
> this, but I think the root issues is the kernel fragmenting packets way
> below MTU size.
7.2-RELEASE .iso @ ~14 Mbps from Ontario, Canada:
%traceroute6 ftp.funet.fi
traceroute6 to ftp.funet.fi (2001:708:10:9::20:1) from
2001:4978:1:600::2, 64 hops max, 12 byte packets
1 unassigned.v6.your.org 18.742 ms 18.863 ms 18.967 ms
2 ge2-47-107.ar1.ord1.us.nlayer.net 19.951 ms 19.985 ms 19.966 ms
3 xe-1-3-0.cr1.ord1.us.nlayer.net 51.970 ms 70.543 ms 51.435 ms
4 xe-4-1-0.cr1.nyc2.us.nlayer.net 87.404 ms 65.532 ms 63.924 ms
5 xe-1-0-0.cr1.lhr1.uk.nlayer.net 135.912 ms 134.998 ms 134.890 ms
6 2001:2000:3081:9::1 149.455 ms 150.032 ms 149.364 ms
7 s-ipv6-b1-link.ipv6.telia.net 149.408 ms 149.922 ms 148.395 ms
8 ldn-ipv6-b1-link.ipv6.telia.net 150.385 ms 148.909 ms 152.906 ms
9 2001:2000:3080:d::2 225.358 ms 220.996 ms 217.359 ms
10 helsinki0-rtr.funet.fi 225.881 ms 234.301 ms 248.352 ms
11 csc0-x0000-helsinki0.ipv6.funet.fi 226.369 ms 226.393 ms 228.843 ms
12 ftp.funet.fi 225.370 ms 226.904 ms 229.846 ms
Steve
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