User's Guide

3e-531AP Wireless Access Point Chapter 4 Gateway Conguration
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3e-531AP Wireless Access Point Chapter 4: Gateway Conguration
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users by conguring the application mapping function offered on this
page. Certain well known applications use specic TCP ports, such as
Telnet (port 23), FTP (port 21), and Web server (port 80). Client computers
on the Private LAN can host these applications, and allow users from the
Internet to access these applications hosted on the virtual servers.
This is done by mapping virtual servers to private IP addresses,
according to the specic TCP port application. As the planning table
below shows, we have identied a Telnet (port 23) virtual server for
private IP 192.168.15.56, a SMTP Mail (port 25) virtual server for pri-
vate IP 192.168.15.33, and a Web (port 80) virtual server for private IP
192.168.15.64. For example, all Internet requests to the gateway for SMTP
Mail services (port 25) to the WAN IP address will redirected to the Pri-
vate Network computer specied by the server IP 192.168.15.33.
Service Port Server IP
23 192.168.15.56
25 192.168.15.33
80 192.168.15.64
We recommend that IP addresses of virtual server computers hosted
on the Private Network be manually (statically) assigned to coincide with
a static server mapping to that specic IP address. Virtual servers should
not rely on the dynamic IP assignment of the DHCP server function
which could create unmapped IP address assignments.
Protocol – Selection of either UDP, TCP, or Both (TCP and UDP) al-
lows these specied network protocols to pass through during the TCP
port communication with each virtual server IP address.
Demilitarized Zone (DMZ)
The Demilitarized Zone (DMZ) host allows one computer on the
Private Network to be totally exposed to the wired network or Internet
for unrestricted two-way communication. This conguration is typically
used when a computer is operating a proprietary client software or 2-way
communication such as video-teleconferencing, where multiple TCP port