A-Link RoadRunner 40/44, Manual

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6.4 NAT Configuration
NAPT
Network Address Translation (NAT) is used in conjunction with an Internet
connection. NAT provides a level of security for private hosts by
translating the address. NAT allows a company to use private address on
its LAN and translate those addresses to a single address. The Router
just supports one-to-many address translation. It translates the address
in the IP packet to the public address and then sets the source port to a
random port number. ( NAPT )
The NAPT function is enabled by default on the Router. If you want to
disable NAT, open the NAT configuration window, select
disabled in the
NAT Configuration . Click the submit button to implement your choice.