Proxicast LAN-Cell 2 User's Guide download pdf (Page 297)

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Chapter 13 Network Address Translation (NAT) Screens

LAN-Cell 2 User’s Guide

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Figure 176 Multiple Servers Behind NAT Example

NAT and Multiple WAN

The LAN-Cell has two WAN interfaces (wired + cellular). You can configure port forwarding

and trigger port rule sets for the first WAN interface and separate sets of rules for the second

WAN interface.

Port Translation

The LAN-Cell can translate the destination port number or a range of port numbers of packets

coming from the WAN to another destination port number or range of port numbers on the

local network. When you use port forwarding without port translation, a single server on the

local network can use a specific port number and be accessible to the outside world through a

single WAN IP address. When you use port translation with port forwarding, multiple servers

on the local network can use the same port number and still be accessible to the outside world

through a single WAN IP address.

The following example has two web servers on a LAN. Server A uses IP address 192.168.1.33

and server B uses 192.168.1.34. Both servers use port 80. The letters a.b.c.d represent the

WAN port’s IP address. The LAN-Cell translates port 8080 of traffic received on the WAN

port (IP address a.b.c.d) to port 80 and sends it to server A (IP address 192.168.1.33). The

LAN-Cell also translates port 8100 of traffic received on the WAN port (also IP address

a.b.c.d) to port 80, but sends it to server B (IP address 192.168.1.34).

" In this example, anyone wanting to access server A from the Internet must use

port 8080. Anyone wanting to access server B from the Internet must use port

8100.

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