Intellinet Network Solutions INT-524315-UM-0808-1 user manual Network Address Translation NAT

3-2 Network Address Translation (NAT)

Network Address Translation (NAT, also known as Network Masquerading, Native Address Translation or IP Masquerading) is a technique of transceiving network traffic through a router that involves re-writing the source and/or destination IP addresses and usually also the TCP/UDP port numbers of IP packets as they pass through. Checksums (both IP and TCP/UDP) must also be rewritten to take account of the changes. Most systems using NAT do so in order to enable multiple hosts on a private network to access the Internet using a single public IP address (see gateway). Many network administrators find NAT a convenient technique and use it widely. In English: The router's NAT function allows the connection of multiple computers to one Internet line. NAT is enabled by default, and there is normally no need to change this.

3-2-1 Basic NAT Settings (Enable or disable NAT function)

Click the 'NAT' menu on the left of the Web management interface top open up the NAT settings screen:

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2

There are two choices here:

NAT (1) is the standard implementation. It offers maximum functionality, but since it requires a higher level of packet analysis, the WAN to LAN throughput (Internet <-> LAN) is lower than the LAN to LAN throughput (LAN <-> LAN).

Fast NAT (2) has limited functionality in comparison with ordinary NAT, so there can be problems with data transfers via certain protocols (such as FTP); on the plus side, Fast NAT delivers a WAN to LAN throughput which is almost as fast as the LAN to LAN throughput.

The recommended choice is 'NAT Enable.' Click Apply to save the settings.