Need help with site to site tunnel.
we're having a strange issue in site to site tunnel setup. On the box (F600) we've couple of Site to Site tunnels configured however only one specific tunnel is causing the idle issue, rest of the tunnels are up & working.
We always need to initiate the traffic from the barracuda end every time to bring up the tunnel, however what's more strange is traffic can only be initiated from barracuda, if we try to initiate the traffic from the other end (Sonicwall), it won't respond. Once this is done, tunnel stays up for couple of mins & if there's no traffic over the tunnel it goes to idle.
The tunnel status always shows up on both ends even though the network is not reachable.
Checked logs on both ends, nothing's there as the tunnel status is up.
Tried changing the tunnel modes, tried with ikev1 & ikev2, DPD timers, key timers, keys, different types of encryption combinations, tried to establish the connectivity over the secondary link, still the same issue.