[no subject]

Yes, you must also forward the GRE protocol 47.  (This is not a TCP
port.)  With iptables:

iptables -A INPUT -p 47 -j ACCEPT

For more troubleshooting info, see:

<a  rel="nofollow" href="http://poptop.sourceforge.net/dox/gre-protocol-unavailable.phtml";>http://poptop.sourceforge.net/dox/gre-protocol-unavailable.phtml</a>

Alan


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