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No traffic flow through site-to-site IPSec VPN tunnel
Tunnel established but can’t get traffic across:
Make sure there are no IP conflicts between the two sites.
Disable the ZyWALL routers firewall.
To disable the ZyWALL’s firewall/policy control, go to:
Configuration
Firewall
OR
Configuration
Security
Policy
Policy Control
Verify that the host you are attempting to reach is pointing to the
ZyWALL for the default gateway.
Check for conflicting policy/static routes. A misconfigured or
out of order route can cause problems. To verify the
policy/static route rules go to,
Configuration
Network
Routing
.
Verify that the host you are attempting to reach is listening for the
traffic you are sending to it. Example: If you’re sending a ping
request to a device, make sure it is set to respond to ping/icmp
requests.
Windows:
Open command prompt or powershell and type
netstat -an
for a list of listening ports.