Version 3.0.1 185 July 2010
MP-20x Telephone Adapter 13. Security
9. Edit the port forwarding rule by modifying its entry under column 'Local Host' in the
screen 'Port Forwarding'. To modify an entry, click the Edit icon for the rule; the
screen 'Edit Port Forwarding Rule' opens. This screen allows you to edit all the
parameters that you configured when creating the port forwarding rule.
10. Click OK to save your changes and return to the screen 'Port Forwarding'.
11. You can disable a port forwarding rule to make a service unavailable without having to
remove the rule from the screen 'Port Forwarding'. This can be useful when making
the service temporarily unavailable and when expecting to reinstate it in the future.
To temporarily disable a rule, clear the check box next to the service name.
To reinstate it at a later time, reselect the check box.
To remove a rule, click the action icon 'Remove' for the service; the service is
permanently removed.
How many computers can use a service or play a game simultaneously? All computers on
the network can use a specific service as clients simultaneously. Being a client means that
the computer within the network initiates the connection - for example, opens an FTP
connection with an FTP server on the Internet. But only one computer can serve as a
server, meaning responding to requests from computers on the Internet. Assigning a
specific computer as a server is done in the Port Forwarding section of Web-based
management.
13.4 DMZ Host
The DMZ (Demilitarized) Host feature allows one local computer to be exposed to the
Internet. Designate a DMZ host to:
Use a special-purpose Internet service, such as an on-line game or video-
conferencing program, that is not present in the Local Servers list and for which no
port range information is available.
To expose one computer to all services, without restriction, irrespective of security.
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 MP-20x. MP-20x forwards 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 receives the request instead.
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