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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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After Outbound NAT Is Configured and then Disabled on an AR Router's Public Network Interface, a SIP User Cannot Be Registered. How Do I Solve This Problem?

After Outbound NAT Is Configured and then Disabled on an AR Router's Public Network Interface, a SIP User Cannot Be Registered. How Do I Solve This Problem?

A SIP user connects to a SIP server through an AR router. After outbound NAT is configured on the AR router, NAT ALG for SIP is disabled and SIP protocol packets cannot traverse the NAT-enabled router. As a result, the SIP user and SIP server cannot communicate with each other and the SIP user cannot be registered.

When a registration request packet sent from the SIP user to the SIP server passes through the AR router, a NAT mapping entry recording packet information is generated, and the entry and aging time are updated when the AR router receives a new registration request packet. When the aging time expires, the router automatically clears NAT mapping entries that are not updated. Therefore, the SIP user who fails to be registered sends registration request packets continuously. If the outbound NAT configuration is deleted, the router does not directly clear the corresponding NAT mapping entry, and automatically clears the entry after the aging time expires. However, registration request packets sent by the SIP user continuously update the NAT mapping entry and aging time. As a result, the router cannot automatically clear the NAT mapping entry and the SIP user cannot be registered.

After configuring outbound NAT, you can run the nat alg command to enable NAT ALG for SIP to maintain communication between the SIP server and SIP user, and run the reset nat session all command to forcibly clear NAT mapping entries and immediately modify the NAT configuration. Alternatively, after disabling outbound NAT, run the reset nat session all command to forcibly clear NAT mapping entries to restore communication between the SIP user and SIP server.

Clearing NAT mapping entries may temporarily affect communication on some packet transmission links.
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Updated: 2019-08-09

Document ID: EDOC1000079719

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