H3C Technologies H3C SecPath F1000-E - Manual (Page 32)

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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