Motorola 7000, 3352N, 3342, 2200 manual Internet Gateway

Administrator’s Handbook

Internet
Gateway
	LAN STN #3
	192.168.1.3
WAN
Ethernet
Interface	LAN
210.219.41.20
	Ethernet
	Interface
NAT	LAN STN #2
	192.168.1.2
	NAT protected
Embedded	NAT Default
Web Server	Server
210.219.41.20	NAT Default Server
(Port 80 default)
	192.168.1.1

You can also use the LAN-side address of the Gateway, 192.168.1.x to access the web and telnet server.

NAT Combination Application. Motorola Netopia®’s NAT security feature allows you to configure a sophisticated LAN layout that uses both the Pinhole and Default Server capabilities.

With this topology, you configure the embedded administration ports as a first task, followed by the Pin- holes and, finally, the NAT Default Server.

When using both NAT pinholes and NAT Default Server the Gateway works with the following rules (in sequence) to forward traffic from the Internet to the LAN:

1.If the packet is a response to an existing connection created by outbound traffic from a LAN PC, forward to that station.

2.If not, check for a match with a pinhole configuration and, if one is found, forward the packet according to the pinhole rule.

3.If there’s no pinhole, the packet is forwarded to the Default Server.

IP-Passthrough.Your Gateway offers an IP passthrough feature. The IP passthrough feature allows a single PC on the LAN to have the Gateway’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.

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