Netopia 3346N-ENT User Guide (en)

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4-28  Firmware User Guide
IP Passthrough
Netopia Firmware Version 8.6.1 offers an IP passthrough feature. The IP passthrough feature allows for a single 
PC on the LAN to have the router’s public address assigned to it. It also provides PAT (NAPT) via the same 
public IP address for all other hosts on the private LAN subnet. Using IP passthrough:
The public WAN IP is used to provide IP address translation for private LAN computers.
The public WAN IP is assigned and reused on a LAN computer.
DHCP address ser ving can automatically ser ve the WAN IP address to a LAN computer.
When DHCP is used for addressing the designated passthrough PC, the acquired or configured WAN 
address is passed to DHCP, which will dynamically configure a single-ser vable-address subnet, and reser ve 
the address for the configured MAC address. This dynamic subnet configuration is based on the local and 
remote WAN address and subnet mask. If the WAN inter face does not have a suitable subnet mask that is 
usable, for example when using PPP or PPPoE, the DHCP subnet configuration will default to a class C 
subnet mask.
Note:
Globally, only one dynamically-configured DHCP subnet is available. If you configure multiple Connection 
Profiles to use IP Passthrough's DHCP option, when any of these profiles is established, the dynamic DHCP 
configuration will be over written. IP passthrough is restricted to the primar y LAN.
In the case of an Ethernet WAN router the IP passthrough configuration is located in the WAN Ethernet 
Configuration menu. For all other routers, it is located in the Connection Profiles' IP Profile Parameters.
The WAN Ethernet Configuration screen, found under the WAN Configuration menu, WAN Setup screen, 
appears as shown.
                          WAN Ethernet Configuration
         Address Translation Enabled:       Yes
         Local WAN IP Address:              0.0.0.0
         NAT Map List...                    Easy-PAT List
         NAT Server List...                 Easy-Servers
         NAT Options...
         Stateful Inspection Enabled:       No
         Filter Set...
         Remove Filter Set
         Enable PPP over Ethernet:          Off
         WAN Ethernet Speed Setting...      Auto-Negotiation
         Wan Ethernet MAC Address:          00:fc:de:fa:dd:02
         DHCP Client Mode:                  Standards-Based
         RIP Options...
Set up the basic IP attributes of your Ethernet Module in this screen.