I am trying to set up a custom tunnel on a local IPFire server to a remote CentOS server, but I am so far not receiving ping replies. I have used the following lines on both ends:
ip tunnel add test mode gre remote x.x.x.x local y.y.y.y dev red0 ttl 64
ifconfig test 10.0.0.51 netmask 255.255.255.0 pointopoint 10.0.0.52
ifconfig test mtu 1500 up
ip link set test up
I have followed these up by restarting the firewalls on both ends (IPFire: /etc/init.d/firewall start). I would appreciate some help.