Westell Inc. ULS3-C ユーザーズマニュアル

 

 
03/24/09 - DRAFT 
 
 

030-300554 Rev. C 

130 

    March 2009 

 

 
If you select Firewall Settings in the top navigation menu and then select Static NAT in the left submenu, the 
following screen appears.  
 
NOTE: A block of static IP addresses must be purchased from Verizon to configure this feature. This Router 
supports 253 static IP addresses. 
 
Static NAT allows LAN devices to use public IP addresses (different from the Router’s public IP address). The LAN 
devices are still configured with private IP addresses (either statically or dynamically through DHCP). Traffic 
between the LAN devices and the Internet is still “NAT’ed,” but the Static NAT mappings allow packets from 
specific devices to use a distinct public IP address; and packets sent to different public IP addresses to be forwarded 
to specific devices. 
 
With Static NAT, devices that are behind the firewall and that are configured with private IP addresses appear to 
have public IP addresses on the Internet. This allows an internal host, such as a Web server, to have an unregistered 
(private) IP address and still be reachable over the Internet. This section also allows you to perform port translations 
(NAPT). 
 
There are three steps to setting up a Static NAT entry: 
 

1.  Create an address pool – These are addresses on your WAN network side. 
2.  Create a NAT rule – This defines the local computer to be NAT’d, the external IP address from the pool 

and the services that are allowed. 

3.  Create a Port Forwarding Rule – This matches the NAT rule you created above and forwards the packets 

received on the WAN side to reach your internal computer. 

 
To configure Static NAT, click the New Entry link.