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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:
1
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.
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