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Symptom, Solution – H3C Technologies H3C SecPath F1000-E User Manual

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Figure 16 Troubleshooting GRE

Symptom

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.

Solution

Execute the display ip routing-table command on Router A and Router C to view whether Router A

has a route over tunnel 0 to 10.2.0.0/16 and whether Router C has a route over tunnel 0 to

10.1.0.0/16.

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

[RouterA] ip route-static 10.2.0.0 255.255.0.0 tunnel 1

IP network

IP network

Router A

Router B

Router C

Host A

Host B

10.1.1.1/16

10.2.1.1/16

Tunnel0

Tunnel0

IP network

GRE Tunnel