Netopia 3300 - Manual (Page 131)

Multiple Network Address Translation 4-35
Select ADD NAT PUBLIC RANGE and press Return. You are returned to the Network Address Translation
screen.
Next, select Show/Change Map List and choose Easy-PAT List. Select Add Map. The Add NAT Map screen
appears. (Now the name Easy-PAT List is a misnomer since it has a static map included in its list.) Enter in
192.168.1.1 for the First Private Address and 192.168.1.5 for the Last Private Address.
Select Use NAT Public Range and from the pop-up menu choose Static Range. Select ADD NAT MAP and
press Return.
This will statically map the first five public IP addresses to the first five corresponding private IP addresses and
will map 206.1.1.6 to the remaining private IP addresses using PAT.
Notes on the example
The Easy-Map List and the Easy-PAT List are attached to any new Connection Profile by default. If you want to
use this NAT configuration on a previously defined Connection Profile then you need to bind the Map List to the
profile. You do this through either the NAT Associations screen or the profile’s configuration screens.
The PAT par t of this example setup will allow any user on the Netopia Router's LAN with an IP address in the
range of 192.168.1.6 through 192.168.1.254 to initiate traffic flow to the outside world (for example, the
Internet). No one on the Internet would be able to initiate a conversation with them.
The Static mapping par t of this example will allow any of the machines in the range of addresses from
192.168.1.1 through 192.168.1.5 to communicate with the outside world as if they were at the addresses
206.1.1.1 through 206.1.1.5, respectively. It also allows any machine on the Internet to access any ser vice
(por t) on any of these five machines.
You may decide this poses a security risk. You may decide that anyone can have complete access to your FTP
ser ver, but not to your Router, and only limited access to the desired ser vices (por ts) on the Web and Mail
ser vers.
To make these changes, first limit the range of remapped addresses on the Static Map and then edit the
default ser ver list called Easy-Ser vers.
Add NAT Map ("Easy-PAT List")
First Private Address: 192.168.1.1
Last Private Address: 192.168.1.5
Use NAT Public Range...
ADD NAT MAP CANCEL