Hi, still trying to understand one thing. I would definitely like to tell iptables to accept all packets coming from remote vpn only if they hit the $VIRTUALVPNINTERFACE. I tried -o ipsec0 but this is not working, looks like ipsec0 device doesn't exist or it is not recognized. I red on the Openswan users list, that Linux kernel 2.6 native ipsec don't create ipsec* interface (if I am not wrong this is something backported on kernel 2.4 RHEL3) just add a route to remote network through eth0, so if I want to ssh the vpn server on his internal ip from the other side of the vpn I need
$IPTABLES -A INPUT -i *$EXTIF* -s $MYEXTNETWORK -d $INTIP -p tcp -m tcp --dport 22 -j ACCEPT
and this is true for any other rule I would use ipsec0 in, I have to use $EXTIF.
Even if I am going to set sshd to listen on a different port, I am a little worried this could harm my machine in any way.
Comments are welcome
Have a nice day Simone