Le Sat, 16 Nov 2002 02:16:36 +0100
Olaf Seibert a écrit :
> I am connected to the IPv6 world via a gif tunnel with mtu 1280. This
> seems to be the default since I didn't set it myself.
[...]
> I can't set the MTU on my tunnel any lower - and setting it higher does
> not help.

AFAIK, 1280 is considered a mininum.

> Any ideas?

I got the very same problem here with a PPPoE connection. The other end of
my gif tunnel has a MTU of 1480 so I found myself receiving packets of
1500 bytes, which don't fit well in a Ethernet frame when you add the PPP
bytes.

I hacked rp-pppoe a bit so it could receive larger frames, and removed a
warning from the NetBSD kernel which would appear every time an oversized
Ethernet frame was received.

And now it works pretty well.

cube

-- 
That's how I did it, Anton. I never saved anything
for the swim back.
Vincent/Jerome, in Gattaca.