4 faqs – Panasonic NN46240-710 User Manual

Page 69

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Nortel Secure Router 8000 Series

Troubleshooting - VPN___________

2 GRE troubleshooting

If the PCs cannot ping through each other, check that PC1 specifies Nortel 1 as the default

gateway and PC2 specifies Nortel 2 as the default gateway.

Troubleshooting procedure

Step 1 Check that a route passes through Tunnel 1/0/0 to 10.2.0.0/16 on Nortel

Step 2 Check that a route passes through Tunnel 2/0/0 to 10.1.0.0/16 on Nortel

Step 3 Check that PC1 specifies Nortel 1 as its default gateway.

Step 4 Check that PC2 specifies Nortel 2 as its default gateway.

—End

Summary

To ensure that the GRE encapsulated packet forwards normally, routes must pass through the

tunnel on both the source router and the destination router.

2.4 FAQs

Q: The system supports specifying the source address of the tunnel by using the

source interface. When I use this method, the tunnel status is not up. After
running the display this interface command in the interface view, I find that the

tunnel source is 0.0.0.0. Why?

A: The cause is that no IP address is specified for the tunnel source interface.

Assign an IP address for the source interface and specify this interface as the source address of
the tunnel.

Q: Why is the tunnel status not up after completing these steps: following the

sequence of configuring an IP address for the tunnel, specifying IP addresses for

the source and destination, and specifying the IP address for the source interface
while configuring a tunnel?

A: The possible cause is that two tunnels are established by using the same source and

destination addresses.

One tunnel uses the IP address as the tunnel source address and the other uses the source

interface as the tunnel source address. In this case, if an IP address is specified for the source
interface, only the status of the tunnel that uses the source interface is up, whereas the status of

the tunnel that uses the IP address cannot be up. To resolve this, specify di^erent source and

destination addresses.

Issue 5.3 (30 March 2009)

Nortel Networks Inc.

2-15