The selected interface is occupied during NAT server configuration

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Q: The selected interface is occupied during NAT server configuration. It is recommended that you run the display port-mapping command to query occupied interfaces before configuring the NAT server. You can select an idle interface.

Other related questions:
Can outbound NAT and NAT server be configured simultaneously on an AR
On an AR router, outbound NAT and NAT server can be configured simultaneously on an interface. For detailed configurations, see "Internet Access > NAT > Example for Configuring NAT to Enable Users to Access the Internet and Provide the WWW Service Externally" in the Typical Configuration Examples.

How is the NAT server configured on the PPPoE dialup interface
On an AR, the NAT server can be configured on the PPPoE dialup interface. 1. Create a dialup interface and configure parameters on the dialup interface. 2. Configure the NAT server on the dialup interface. The internal IP address of the internal server is 192.168.20.2/24, the port used for providing services is port 8080, and the external address is 202.169.10.5/24. [Huawei] interface dialer 1 [Huawei-Dialer1] nat server protocol tcp global 202.169.10.5 www inside 192.168.20.2 8080 [Huawei-Dialer1] quit

Do interfaces conflict when the NAT server and outbound NAT are configured on the AR router
Interfaces do not conflict when the NAT server and outbound NAT are configured on the AR router.

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