Network Address Translation (NAT) supports source network address translation (Static NAT) and destination network address translation (Dynamic NAT), implementing network communication by translating LAN addresses into Internet addresses. Support destination NAT to map the access to a WAN address to a LAN address. Support the mapping of the access to an Internet address to multiple IP addresses in a LAN to implement the load balancing access of LAN servers.  Support the destination port translation. Four functional modules are provided, including IPv4 NAT, IPv6 NAT, NAT64 Translation, and DNS-Mapping.