Netopia R2020 - Manual (Page 131)

Multiple Network Address Translation and IP Setup 10-5
■ The Local WAN IP Address is used to configure a NAT public address range consisting of the Local WAN IP
Address and all its por ts. The public address map list is named
Easy-PAT List and the por t map list is
named Easy-Ser vers.
When you exit this screen the two map lists, Easy-PAT List and Easy-Ser vers, are created by default and
NAT configuration becomes effective.This will map all your private addresses (0.0.0.0 through
255.255.255.255) to your public address. These map lists are bound to the Easy Setup Profile. See
“Binding Map Lists and Ser ver Lists” on page 10-18 .
This is all you need to do if you want to continue to use a single PAT, or 1-to-many, NAT configuration.
■ In order to configure the router to make ser vers on your LAN visible to the Internet, you use advanced
features in the System Configuration screens, described in
“IP setup” on page 10-5 .
Note: There is no implicit binding between the WAN IP inter face address and NAT, as in earlier firmware
versions, so you cannot disallow configuration of NAT simply because the inter face is numbered or disallow
configuration of the addressing type (numbered or unnumbered) simply because NAT is enabled.
If the router has a numbered inter face, then it is addressable by the IP address. With PAT, when NAT was
enabled the inter face would be marked unnumbered and the IP address subsumed by NAT. However, NAT would
allow traffic directed to that IP address to be delivered to the router. This effectively made the inter face a
numbered inter face. MultiNAT adds the option of true unnumbered NAT. Traffic delivered to the router on an
unnumbered inter face which cannot be processed by NAT is dropped.
IIIIP P P P ssssee e ettttu u u up p p p
To access the NAT configuration screens, from the Main Menu navigate to IP Setup:
Main
Menu
System
Configuration
IP
Setup
Network
Protocols Setup