3Com 3C840 manual Configuring Static, PAT Port Entries, Press the Modify button to set the address

	Configuring Static PAT Port Entries 6-3
	Press the Modify button to set the address.
Configuring Static	Press the Static Transmission Control Protocol (TCP) or Static User
PAT Port Entries	Data Protocol (UDP) button to access the static port tables.

■Static TCP — Press this button to access the static PAT TCP table (above). Using this table, you can map public TCP ports to private IP address / TCP port pairs.

This is useful for controlling access to the LAN by remote users. For example, an entry containing public TCP port 80, the IP address of a web server on your LAN, and the private TCP port 80 allows controlled access to the web server but not the rest of your LAN. (For a list of assigned port numbers, see RFC-1700, Assigned Numbers document which is available from the Internet.)

■Static UDP — Press this button to access the static PAT UDP table (above). Using this table, you can map public UDP ports to private IP address / UDP port pairs. This is useful for controlling access to the LAN by remote users. (For a list of assigned port numbers, see RFC-1700, Assigned Numbers document which is available from the Internet.)