R: MTU issue routing traffic via Cisco GRE tunnel to Nokia/Check Point firewall

["edp" <edp.lists () acerbis it>]

> The simple solutions are:
> - - use 'ip tcp adjust-mss 1400' on a router seeing traffic in the
clear to > force MSS to 1400 so IP datagram size to 1420 (of course 1400
is just a >guess), this will cover all TCP traffic
> - - set 'ip mtu 1500' on the GRE tunnel interface (yes 1500 bytes)


Just for clarity, with a mss option set to 1400, the ip packet size will
be 1440.




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