Zyxel-communications 5 Series Manual do Utilizador descarregar pdf (Página 406)

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ZyWALL 5/35/70 Series User’s Guide

406 Chapter 21 Network Address Translation (NAT)

Figure 216 Multiple Servers Behind NAT Example

21.5.4 NAT and Multiple WAN

The ZyWALL has two WAN ports. You can configure port forwarding and trigger port rule

sets for the first WAN port and separate sets of rules for the second WAN port.

21.5.5 Port Translation

The ZyWALL 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 ZyWALL 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

ZyWALL 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).

Note: 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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