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Chapter 4: Advanced Setup Options 29
If you want to use a special application that isn’t on the Gateway’s
preprogrammed list, we recommend that you first visit this web
site:
www.practicallynetworked.com/sharing/specialapps.htm.
This site contains easy-to-understand instructions about special
applications and trigger and port usage. It also includes a list of
open ports, which you will need to manually set triggers and
incoming ports.
A trigger is the numeric name for an outbound port. If you send an
outbound packet that is associated with a particular trigger, the
Gateway will monitor this packet; when it sees an inbound packet
associated with this trigger, it will allow the inbound packet
through the firewall.
An incoming port is the numeric name for an inbound port.
Incoming ports are always associated with certain triggers. The
Gateway “binds” single or multiple inbound packets to certain
triggers, and allows those specified packets through the firewall,
once they are “triggered” by the outbound ports.
Note:
Only one computer at a time can use a special application
and open port(s).
For some specialized applications, modifying the firewall settings in
the way described above will not suffice. Some applications—
NetMeeting, for example—require completely unrestricted access.
For these applications, you should use the alternative method of
changing the IP address of the DMZ Host, described below.
Setting the DMZ Host’s IP Address
If you want to allow one computer on your LAN unrestricted
Internet access (for example, to set up a web server), you can
define a DMZ (Demilitarized Zone) for it. All IP packets flowing
to and from that computer will be unrestricted by the firewall. You
can define one IP address for this DMZ host. Follow these steps.