Configuration prerequisites
Perform the following tasks before configuring dynamic NAT:
Configure an ACL to identify the IP addresses to be translated. The match criteria include the source IP address, source port number, destination IP address, destination port number, transport layer protocol, and VPN instance. For more information about ACLs, see ACL and QoS Configuration Guide.
Determine whether to enable the Easy IP feature. If you use the IP address of an interface as the public address, you are configuring Easy IP.
Determine a public IP address pool for address translation.
Determine whether to translate port numbers. Use NO-PAT to translate only IP addresses and PAT to translate both IP addresses and port numbers.