On Wednesday 12 February 2003 19:22, Amith Varghese wrote:
> I spoke too soon. I can ping Linux B from Linux A with no problems.
> However if I don't use the tunnel for a little while, I am unable to
> initiate a ping to Linux A from Linux B. If I go back to Linux A and then
> ping Linux B and then try again from Linux B back to Linux A everything
> works. Looks like Linux A is unable to initiate the tunnel.
You have a firewall between B and A, it is blocking B from A.
Firewall forgets UDP port mappings after a short while and UDP
packets from A cannot reach B.
1) set ping=NN in config file at B. ciped will send keepalive packets
every NN secs.
2) set up a ping watchdog which restarts ciped on B
if pings stop working.
(2) is better. It restores tunnel (and can log errors, email root,
engare fire siren etc ;)