Configuring Address Translation; Disabling Address Translation - Nortel BayStack Instant Internet 100-S Using Manual

134 Chapter 5 Advanced IP configuration

Configuring address translation

Address translation allows the Instant Internet unit to route traffic that has private
or reserved IP addresses to and from the Internet. Instant Internet can isolate your
LAN from the Internet by performing address translation on routed packets,
which enables it to translate workstation addresses into legal IP addresses. IP
address translations are totally transparent to workstations on the LAN.
Some of the benefits of using Instant Internet as an address translator include:
• Translating addresses transparently.
• Simplifying the administrator's task by allowing existing, private addressing
schemes to be used while still allowing Internet access.
• Acting as a firewall.
If the Instant Internet unit is currently running address translation and is logically
installed between the servers you want to be public (for example, Web servers or
mail servers) and the Internet, then you must add provide some additional
configuration. See

Disabling address translation

When Instant Internet hardware and software are installed, output address
translation is automatically enabled as a default for your unit. However, if you are
using IP forwarding, you should disable address translation. For more information
on IP forwarding, refer to
To disable address translation:
1 Start Setup, and if prompted, select a unit to configure.
2 In the Interfaces area, select your WAN interface in the list and then click
Configure.
The <interface name> Configuration dialog box opens
300868-G
"Publishing a private server" on page
"Configuring IP forwarding" on page
135.
130.
(Figure 64).