Appendixes > C - Tunnel Troubleshooting > Are the Appliances Talking?

Are the Appliances Talking?

  1. 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
  2. If bidirectional conversations are occurring, try changing to GRE or UDP. This is perhaps an IPsec issue, see Debugging IPSec Tunneling.