Allow ESP traffic on IPCop/iptables?

I refer to the last couple of comments on this question:
http://www.experts-exchange.com/Networking/Q_21779394.html

How can I allow ESP traffic through an IPCop firewall?
And how do I make sure that UDP ports 450 and 5000 are allowed both ways (incoming is defined in port forward)?
realfohAsked:
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Gabriel OrozcoSolution ArchitectCommented:
don't know ipcop but these are the iptables rules:

iptables -A FORWARD -p esp -j ACCEPT

iptables -A FORWARD -p udp --dport 450 -j ACCEPT
iptables -A FORWARD -p udp --dport 5000 -j ACCEPT

maybe you need to open INPUT if the server software is running on the same box as your linux firewall:
iptables -A INPUT -p esp -j ACCEPT

you only need to open the input rules when the final connection point is the same linux box. if traffic should pass across, then use the forward chain.

Regards.

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