Problem with Path MTU Discovery
gnn at freebsd.org
gnn at freebsd.org
Thu Jul 14 03:47:52 GMT 2005
At Wed, 13 Jul 2005 15:00:42 +0200,
Jeremie Le Hen wrote:
>
> Hi,
>
> I set a gif(4)-based IPSec tunnel between my network and a friend's one.
> This works pretty well, except that Path MTU Discovery doesn't work.
>
> Quick draw:
> MTU: 1500 MTU:1280 MTU:1500
> Comp1 --------- Gate1 -------- Gate2 -----+-- Comp2
> RELENG_5 RELENG_4 RELENG_5 | RELENG_5
> |
> +-- Comp3
> RELENG_5
>
Can you look at the routing table for each of Comp1 and Comp2 and also
use the -W flag to show the path MTU? If there is something wonky in
the routing table then TCP will not hear about the MTU change.
Thanks,
George
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