Port Triggering - AudioCodes MP-202 User Manual

MP-202 Telephone Adapter
Warning: A DMZ host is not protected by the firewall and may be vulnerable to attack.
Designating a DMZ host may also put other computers in the home network at risk. When
designating a DMZ host, you must consider the security implications and protect it if
necessary.
An incoming request for access to a service in the home network, such as a Web-server, is
fielded by the MP-202. The MP-202 will forward this request to the DMZ host (if one is
designated) unless the service is being provided by another PC in the home network
(assigned in Local Servers), in which case that PC will receive the request instead.
To designate a local computer as a DMZ Host:
1. Click tab 'DMZ Host'; the screen 'DMZ Host' opens (refer to the figure).
2. Enter the local IP address of the computer to be designated as a DMZ host. Note that
only one LAN computer can be a DMZ host at any time.
3. Click 'OK' to save your changes and return to the screen 'DMZ Host'.
You can disable the DMZ host so that it will not be fully exposed to the Internet, but keep
its IP address recorded on the 'DMZ Host' screen. This may be useful if you wish to disable
the DMZ host but expect that you will want to enable it again in the future.
To disable the DMZ host so that it will not be fully exposed to the Internet, clear the
check-box next to the DMZ IP designation and click 'OK'.
To re-enable the DMZ host later, recheck the check-box.
12.5

Port Triggering

Port triggering can be used for dynamic port forwarding configuration. By setting port
triggering rules, you can allow inbound traffic to arrive at a specific LAN host, using ports
different than those used for the outbound traffic. This is called port triggering since the
outbound traffic triggers to which ports inbound traffic is directed.
User's Manual
Figure 12-12: DMZ Host
151
12. Security
February 2007