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packet forwarding


In Lenny, "man openvpn" states,
"First, ensure that IP forwarding is enabled on both peers.   On  Linux,
       enable routing:

              echo 1 > /proc/sys/net/ipv4/ip_forward"

That is an interactive approach whereas in /etc/sysctl.conf I set 

"man openvpn" continues,
 "... enable TUN packet forwarding through the firewall:

        iptables -A FORWARD -i tun+ -j ACCEPT"

>From this I infer that permission for TUN packet forwarding 
is distinct from general packet forwarding.  Correct?
What would be the conventional way to turn this on 
permanently in Lenny?

Thanks for any help,           ... Peter E.

http://carnot.yi.org/ = http://carnot.pathology.ubc.ca/

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