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