Hello, I have a rather complicated need to use a gre tunnel and I am having difficulty getting it working. The tunnel is between my home server and Oracle VM. Below is a picture of the topology with config.
Pings between the home server and Oracle VM over the gre tunnel do not seem to be going through as evidenced by tcpdump. I do notice however that the firewall has the correct state table showing that address translation. I am certain that both machines' firewalls are not dropping packets because iptables is not showing anything dropped. I am at a loss here so I welcome any ideas.
gre implies you want to run dynamic routing over the tunnel but no routing is configured? If you don't need dynamic routing (why would you on a P2P tunnel?) but do want privacy then use IPsec or SSH instead?