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

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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.

Other related questions:
After the NAT server based on the IP address and port number is configured, the mapping takes ineffective
After the NAT server is configured based on the IP address and port number, the mapping takes ineffective. Perform the following operations to locate the fault: 1. Access the internal server to determine whether the internal server can communicate. 2. Check whether there are reachable routes between the device configured with the NAT server and the external host and internal server. 3. Check whether the NAT server configuration is correct. 4. Check whether the mapped external port number is available, and replace the external port to check whether the internal server can be accessed. 5. Run the display nat session command on the device configured with the NAT server to check whether there are entries before and after mapping. Obtain packets and check whether addresses in packets for access of external users are translated on the device configured with the NAT server.

How to configure port mapping on an AR that acts as a twice NAT server
For details about how to configure port mapping of twice NAT server on an AR, see "Internet Access > NAT > Example for Configuring NAT to Connect Intranet Users to the Internet, Provide the Web Server, and Enable Intranet Users to Access an Internal Web Server Using Domain Names" in the Typical Configuration Examples.

How do I locate the 3G dialup failure on an AR
Run the display cellular interface-number network command to check the value of the Current Service Status field. - When the value of the Current Service Status field is Service Available, the 3G service is available. Check the following configurations: 1. Check whether the dialer number is configured correctly. 2. If the 3G interface is connected to the WCDMA network or a network that is compatible with the WCDMA network, check whether the APN is configured correctly. 3. Check whether the authentication mode, user name, and password are configured correctly. 4. Check whether the dialer ACL is configured correctly. 5. Check whether static routes are configured correctly. - When the value of the Current Service Status field is No Service, the 3G service is unavailable. Check the following configurations: 1. If the 3G interface is connected to the WCDMA network or a network that is compatible with the WCDMA network, run the display cellular interface-number network command to check values of the Mobile Country Code (MCC), Mobile Network Code (MNC), and Mobile Operator Information fields and check whether the PLMN selected by the 3G modem is consistent with that of the carrier. If the 3G interface is connected to the CDMA2000 network or a network that is compatible with the CDMA2000 network, you can skip this step. 2. Run the display cellular interface-number radio command to check the value of the Current RSSI field. 3. Check whether the 3G data card is supported by the AR. 4. Run the display cellular interface-number radio command to check the value of the SIM Status field and check whether the SIM, USIM, or UIM card status is normal. 5. Check whether the 3G hardware (including the 3G data card/3G interface card/3G model), SIM/USIM/UIM card, or 3G antenna is damaged, not properly installed, or not fastened. 6. Check whether the angle of the 3G antennas is proper. 7. Check whether 3G/2G services are enabled on the SIM, USIM, or UIM card and whether the users owe fees. 8. Run the display cellular interface-number radio command to check the value of the PIN Status field.

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