Re: GRE, VPN and suchlike

[Martin Berg <martin@default.nu>]

> 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 1.2.3.4 -j ACCEPT

Best regards

Martin Berg


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