ATL Telecom AM30 - Manual (Page 73)

ATL Telecom User Guide
AM30
7
3
apply to a range of port types, or enter the same port
number in both fields.
If you leave the selection set to Any other port, then
incoming data will not be checked for the destination
port type.
A port ID identifies the specific function of the computer
connected to it, and therefore can limit the types of data
that pass to and from the computer. For example, Web
(HTTP) servers are usually identified by port number 80;
packets containing traffic destined for a Web server will
contain this port ID. The Internet Assigned Numbers
Authority (IANA) assigns port numbers for common types
of servers and functions.
7. If the LAN computer that you are making publicly available is
configured to use a non-standard port number for the type of
traffic it receives, type the non-standard port number in the
Local Port field.
This option translates the standard port number in
packets destined for your LAN computer to the non-
standard number you specify. For example, if your Web
server uses (non-standard) port 2000, but you expect
incoming data packets to refer to (standard) port 80, you
would enter 2000 here (and select HTTP or type 80 in the
Destination Port fields). The headers of incoming packets
destined for port 80 will be modified to refer to port
2000. The packet will then be routed appropriately to
the web server.
8. Follow steps 8-12 under "The NAPT rule" on page 68 to
submit your changes.