Hosts at both ends of a GRE tunnel cannot ping each other

The interfaces at both ends of the tunnel are configured correctly and can ping each other, but Host A and Host B cannot ping each other.

To resolve the issue:

1. Execute the display ip routing-table command on Device A and Device C to view whether Device A has a route over tunnel 0 to 10.2.0.0/16 and whether Device C has a route over tunnel 0 to 10.1.0.0/16.

2. If such a route does not exist, execute the ip route-static command in system view to add the route. Take Device A as an example:

   [DeviceA] ip route-static 10.2.0.0 255.255.0.0 tunnel 0
   

3. If the issue persists, contact Hewlett Packard Enterprise Support