Whether the public IP address mapped to the USG5530 must be configured for the external network port or NAT address pool

2

You only need to configure NAT Server for the mapping instead of configuring the public IP address for the external network port or NAT address pool.

Other related questions:
Whether an address in the NAT address pool can be configured as a public IP address for NAT Server
Yes.

How do I configure the AR router to map multiple internal IP addresses to external IP addresses using a NAT address pool
A Huawei AR router can use the NAT address pool to implement mapping between internal IP addresses and public IP addresses in the public address pool. The configuration is as follows: 1. Configure a NAT address pool on the router. [Huawei] nat address-group 1 202.169.10.100 202.169.10.200 2. Configure an ACL rule to permit the internal address segment that allows NAT translation. [Huawei] acl 2000 [Huawei-acl-basic-2000] rule 5 permit source 192.168.20.0 0.0.0.255 [Huawei-acl-basic-2000] quit 3. Associate outbound NAT with an address pool on an outbound interface [Huawei] interface gigabitethernet 3/0/0 [Huawei-GigabitEthernet3/0/0] ip address 202.169.10.1 24 [Huawei-GigabitEthernet3/0/0] nat outbound 2000 address-group 1 [Huawei-GigabitEthernet3/0/0] quit

Must contiguous addresses be specified in a NAT address pool
No. The NAT address pool contains an address segment from a specific start address to a specific end address. You can configure address exclusion to exclude special addresses in this address segment. Therefore, the addresses in the NAT address pool can be non-contiguous. In addition, the start address and end address can be the same. In this case, the NAT address pool contains only one IP address.

Can addresses in a NAT address pool be configured as public addresses mapped to private addresses of intranet servers on an FW enabled with NAT server
Yes.

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