In home networking, port forwarding,
also called port mapping or punch-through
, enables you to create a permanent translation entry that maps a protocol
port on your gateway machine to an IP address
and protocol port on your private LAN
. It’s a transparent
process, meaning network clients
cannot see that port forwarding is being done. This process enables you to run a public Internet service on a machine that is otherwise hidden from the Internet by your gateway
. Port forwarding may also be used to aggregate traffic from an application that uses several ports for transactions and consolidate it into one port for reporting the total traffic identified with that application.
Also see Well-Known TCP Port Numbers in the Quick Reference section of Webopedia.