the correct ipv6 behavior for interfaces with gif tunnel on them

[JINMEI Tatuya /神明達哉]

>>>>> On Thu, 9 Dec 2004 18:53:37 +0100, 
>>>>> "Konstantin KABASSANOV" <Konstantin.Kabassanov at lip6.fr> said:

>> 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...

This is not the intended behavior, and seems to be fixed at least on
FreeBSD 5.3.  I don't know whether the change is merged into 4.x.  At
least it's not the case with FreeBSD 4.10.

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei at isl.rdc.toshiba.co.jp