Are the Appliances Talking?
- Verify Bi directional traffic flow
- Use tcpdump to verify traffic is coming/going from the data center
- ssh to the data center appliance
- tcpdump –i bvi0 host 97.174.110.10 (example remote appliance IP)
- You should see traffic coming and going to that IP
- If bidirectional conversations are occurring, try changing to GRE or UDP. This is perhaps an IPsec issue, see Debugging IPSec Tunneling.