ICR-1601
84
2.5 Port Forwarding
Network address translation (NAT) is a methodology of remapping one IP address space into another
by modifying network address information in Internet Protocol (IP) datagram packet headers while they
are in transit across a traffic routing device. The technique was originally used for ease of rerouting traffic
in IP networks without renumbering every host. It has become a popular and essential tool in conserving
global address space allocations in face of IPv4 address exhaustion. The product you purchased embeds
and activates the NAT function. You also can disable the NAT function in [Basic Network]-[WAN & Uplink]-
[Internet Setup]-[WAN Type Configuration] page.
Usually all local hosts or servers behind corporate router are protected by NAT firewall. NAT firewall
will filter out unrecognized packets to protect your Intranet. So, all local hosts are invisible to the outside
world. Port forwarding or port mapping is function that redirects a communication request from one
address and port number combination to assigned one. This technique is most commonly used to make
services on a host residing on a protected or masqueraded (internal) network available to hosts on the
opposite side of the router (external network), by remapping the destination IP address and port number
There are several optional Port Forwarding related functions in this router. They are Virtual Server,
Virtual Computer, IP Translation, Special AP & ALG, DMZ and Pass Through, etc. The available functions
might be different for the purchased model.
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