I have setup an IPSEC VPN tunnel between 2 sites. The Draytek Vigor 2820 dials the fortigate 100a and the tunnel comes up ok. I can ping all devices behind the Fortigate with no problem, but when pinging the other direction I get nothing.
Fortigate has an internal subnet 192.168.111.0/24
Draytek has an internal subnet 192.168.100.0/24
I can see on the stats of the fotigate that data is going both ways so what could be stopping me pinging the Draytek and that network.
If iI tracerout the external IP of the Draytek from behind the Fortigate it goes through as expected. If I tracert the internal IP of the Draytek it gets half way then times out.
If I tracert the Fortigate from the Draytek I get nothing, yet all pings work fine. Even exchange and rdp are working fine.
This doesn't make sense to me. What am a I missing?