> I think you have to add L2TP encapsulation overhead as well
> the PPP(oE) session is encapsulated in a L2TP tunnel from Swisscom's
> aggregation box to each ISP as far as I remember
Yes, thats right. And the Interface between Swisscom and the ISP is
FastEthernet.
So the MTU Size is 1492 on this Interface. Now, the problem is the df
Bit which some firewalls likes to set.
A solution could be with the adjust-mss and ip mtu Cisco feature.
Cheers
Erich
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