the correct ipv6 behavior for interfaces with gif tunnel on them

[Konstantin KABASSANOV]

>-----Original Message-----
>From: JINMEI Tatuya / _–¾’BÆ [mailto:jinmei at isl.rdc.toshiba.co.jp]
>Sent: jeudi 9 décembre 2004 05:53
>To: Konstantin KABASSANOV
>Cc: net at freebsd.org
>Subject: Re: the correct ipv6 behavior for interfaces with gif tunnel on
>them
>
>>>>>> On Wed, 8 Dec 2004 13:22:10 +0100,
>>>>>> "Konstantin KABASSANOV" <Konstantin.Kabassanov at lip6.fr> said:
>
>> I have a freebsd box with a gif tunnel configured. I observed that even
>if
>> ifconfig displays MTU 1500 for both gif and physical interface, 1300
>bytes
>> ipv6 packets transiting on the gif interface are systematically
>fragmented
>> while transiting on the lower physical interface to 1280 bytes. Is it
the
>> normal behavior?
>
>Please provide more detailed network configuration.  Are you talking
>about a router box forwarding packets onto gif and physical
>interfaces?

Well, this is a router box with 2 physical interfaces (say xl0 and rl0).
Rl0 has a gif tunnel (gif0) over it. Xl0,rl0 and gif0 announce in their
ifconfig an MTU of 1500, but 1300 bytes traffic generated from this box
and sent through the gif0 interface is fragmented by the rl0 interface to
1280 bytes...
 
  Please also specify the OS name (which I guess is
>FreeBSD) and its version.

FreeBSD 4.7 (yes it is a little bit old, but I think the problem still
persist in more recent versions)... And that's why I'm asking if this
behavior is normal or not...

Thanks.

Konstantin

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