User guide

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Link: IP Passthrough
When you click IP Passthrough , the IP Passthrough Configuration page appears.
The IP passthrough feature allows 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 serving can automatically serve 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-
servable-address subnet, and reserve the address for the configured PC’s MAC
address. This dynamic subnet configuration is based on the local and remote WAN
address and subnet mask. If the WAN interface 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.
1. Select either User Configured PC or an IP address displayed in the selec-
tion window (these are the IP addresses currently being served to com-
puters on your LAN.)