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Date:      Fri, 15 May 2009 12:57:27 -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:  <4A0D9EF7.3030101@ibctech.ca>
In-Reply-To: <4A0D6253.7080509@ibctech.ca>
References:  <20090514214235.B09701CC12@ptavv.es.net> <4A0D6253.7080509@ibctech.ca>
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[-- Attachment #1 --]
Steve Bertrand wrote:
> 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:

...doh!

Given that fetch does v4, that 14Mb translates into ~500Kb when using v6 ;)

Steve

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