Avaya, Inc.
- 151 - PARTNER ACS 1600 DSL module User Guide
9. NAT configuration
This chapter walks you through the steps required to
configure the Network Address Translation (NAT). For more
information on the menus, submenus and commands in this
chapter, see the “Menu interface” chapter.
The setup of IP networks can be difficult and time consuming,
as each requires an IP address, subnet mask, DNS address
and a default router.
If you enter once piece of information incorrectly, the network
connection does not function and there may be no indication
of what is wrong.
NAT prevents this scenario by:
Modifying IP addresses and checksum without
impacting traffic.
Automatic network configuration - if you configure
DHCP. For more information, see the “DHCP
configuration” chapter.
Packet level filtering and routing.
Traffic logging.
A significant advantage of NAT lies in the fact that you can
configure it without having to change host or routers – other
than those few routers on which NAT is configured.
NAT multiplexes traffic from the internal network and presents
it to the Internet as if it is from a single source that has only
one IP address.
You must complete the following steps to configure NAT:
Enable NAT translation by port (factory default =
disabled)
Configure the NAT local server entry
Configure the NAT Transmission Control Protocol
(TCP) or User Datagram Protocol (UDP) timeouts
Configure the NAT port range
