DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
2-16
Basic Installation and Configuration
v1.0, May 2008
5.
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Configuring the WAN Mode
The ProSafe Wireless ADSL Modem VPN Firewall Router provides two flexible WAN ports. You
can use a single port or you can configure both, with one as a backup connection in case of a
failure. In addition, the ports can be used for classical routing or for simple NAT or multi-NAT.
Choosing a Routing Method
The WAN ports of the ProSafe Wireless ADSL Modem VPN Firewall Router can be configured
for NAT or Classical Routing. You must select one routing method for both WAN ports:
•
NAT
. Network Address Translation (NAT) allows many PCs on your LAN to share a single
public IP address for Internet access. PCs on your LAN can use any private IP address range,
and these IP addresses are not visible from the Internet. If you have more than one public IP
address, you can configure multi-NAT to assign the additional addresses to individual devices
on your LAN.
•
Classical Routing
. In this mode, the DGFV338 performs routing, but without NAT. To gain
Internet access, each PC on your LAN must have a public IP address.
If your ISP has allocated many IP addresses to you, and you have assigned one of these
addresses to each PC, you can choose Classical Routing for Internet access. Alternatively, you
can use Classical Routing for routing private IP addresses within a campus environment, but
this method will not allow Internet access.
Choosing Single or Dual WAN Operation
Depending on the WAN port configuration of the ProSafe DGFV338, you can select one of two
options:
Note:
You can also set up the traffic meter for the Ethernet ISP, if desired, at this time.
See
“Programming the Traffic Meter” on page 2-22
.
Note:
If your ISP provides only a single Internet IP address, you MUST use NAT.
