Xblue Networks X-25 - Manual (Page 65)

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Port Triggering
Port Triggering allows you to grant one or more ports access, called Punching a hole, through the Firewall.
The Firewall’s job is to block unauthorized access to your network. In addition, some applications, such as AOL
aim, uses one port while being processed over the Internet, but a different one while on the LAN.
“Advanced Setup”