How to locate the mapping failure problem after the NAT server based on the IP address and port number is configured on an AR

After the NAT server based on IP address + port number mapping, the mapping fails. Use the following method:
1. Check whether the internal network server can be accessed. You can access the internal server through the intranet.
2. Check whether there are reachable routes from the external host and internal server to the NAT server.
3. Check whether the NAT server is correctly configured.
4. Check whether the mapped external port number is available. Replace the external port to determine whether you can access the internal server.
5. Run the display nat session command on the NAT server to check whether there are entries before and after mapping, and obtain packets to check whether the NAT server translates the address of data packets of external user access.

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