R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

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You must run XLog on the NAT log server or the system log server to view NAT log information.
Troubleshooting NAT
Symptom 1
Abnormal translation of IP addresses.
Solution
1. Enable debugging for NAT. Try to locate the problem based on the debugging display.
2. Use other commands, if necessary, to further identify the problem. Pay special attention to the
source address after the address translation and make sure this address is the address that you
intend to change to. If not, there might be an address pool bug.
3. Make sure a route is available between the destination network and the address pool segment.
4. Be aware of the possible effects that the firewall or the ACLs have to NAT, and also pay attention
to the route configurations.
Symptom 2
The internal server does not function correctly.
Solution
1. Verify that the internal server host is correctly configured.
2. Verify the router is correctly configured with respect to the internal server parameters, such as the
internal server IP address.
3. Use the display acl command to verify that the firewall permits external access to the internal
network. For more information about firewall, see Security Configuration Guide.