Firewall Wizards: Re: MTU issue routing traffic via Cisco GRE tunnel to Nokia/Check Point firewall

[rainer.ginsberg () basf-it-services com]

> We have been suffering an issue to do with Checkpoint, Cisco GRE tunnels
> and MTU size for a number of months now, and I thought it might be worth
> posting a description of our problem on this list in case someone is able
> to help.  We feel that we have exhausted most avenues of trying to
> troubleshoot this issue.
You might try the solution SK14995 of Check Point's knowledge base. It
suggest to set "fw_clamp_tcp_mss = true" in objects_5_0.C in conjunction
with tuning the MTU size of the Interface in question.

Best regards,
Rainer


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