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Re: GRE, VPN and suchlike

But now it is time to setup GRE, tunneling, L2TP etc... And I cannot find a reference to this GRE-port-47 thing in the Debian doc.

It means that my Debian fw should pass all VPN encapsulated packets back and forth.

I am using Debian potato 2.2r5 on these firewalls kernel 2.2.19.

Has anybody any idea ?

Any help greatly appreciated

DISCLAIMER: I have no experience of GRE or tunneling in this manner but you asked for any idea:

47 is not the port number, its the protocol number. Try something like (i guess you are using ipchains? Right?):
-A input -p 47 -s -j ACCEPT

Best regards

Martin Berg

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