DISCLAIMER: I have no experience of GRE or tunneling in this manner but you asked for any idea:
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
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 1.2.3.4 -j ACCEPT
Best regards
Martin Berg
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