Does the AR router support the NAT function

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All Huawei AR routers support NAT.

Other related questions:
Does AR router NAT function supports multiple VPN instances ?
Yes, NAT function supports multiple VPN instances.

Whether AR router can achieve NAT Server redundancy backup function?
AR router does not support NAT Server redundancy backup function.

Does an AR router support the firewall function
All AR series routers support the firewall function.

Method used to configure static NAT on the AR
Huawei AR routers support static NAT. Use either of the following methods to configure static NAT: Method 1: Configure static mapping in the interface view. Translate the combination of the public IP address 202.10.10.1 and port 200 in TCP packets to the combination of the private IP address 10.10.10.1 and port 300. [Huawei] interface gigabitethernet 1/0/0 [Huawei-GigabitEthernet1/0/0] nat static protocol tcp global 202.10.10.1 200 inside 10.10.10.1 300 Method 2: Configure static mapping in the system view. Translate the combination of Loopback 4 interface address and port 43 in TCP packets to private address 192.168.2.55. [Huawei] nat static protocol tcp global interface loopback 4 43 inside 192.168.2.55 netmask 255.255.255.255 For details on the static NAT configuration, see "NAT Configuration->Configuring NAT->Configuring Static NAT" in Configuration Guide - IP Service.

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