port forwarding


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port forwarding

Also called "port mapping," port forwarding is directing traffic from the outside world to the appropriate server inside a local TCP/IP network. Internet services are identified by a standard port number; for example, Web traffic uses port number 80. If the local network hosts a Web server that is accessible on the public Internet, the port forwarding panel in the router would be configured to direct Web/HTTP packets (port 80 traffic) to the IP address of the Web server in the local network (LAN). See TCP/IP port.

Ports are "opened" and "closed" in the firewall, which determines which types of traffic are allowed in or out. In a company, stand-alone commercial firewalls are used. In the home and small business, the firewall is built into the wireless router. For more details, see opening a port. See firewall, wireless router and port triggering.


Forward Web Traffic
If a company hosts its own website, the router adds the IP address of the Web server to all incoming port 80 packets (HTTP packets) from the Internet.







Forward Voice Over IP (VoIP) Traffic
Many companies use the Internet and their local network for telephone service. Because the outside world can "phone in" to the network, those packets must be directed to the company's digital PBX, which uses the SIP protocol. Depending on VoIP provider, the SIP port numbers vary. See SIP and SIP provider.
References in periodicals archive ?
Designed to accommodate the needs of enterprises of all sizes, the TMX family also features a number of performance enhancements in link load balancing, monitoring/reporting, network address translation, port forwarding, and disaster recovery.
AP 160--An enhanced 802.11g indoor AP that includes a four-port router/gateway, DHCP, NAT, port forwarding, WDS, and a detachable antenna
Additional features of the WireSpeed R517 modem include Virtual Private Network (VPN) support via Point-To-Point Tunneling Protocol (PPTP) for telecommuters who need to access their corporate network from their homes or satellite offices; True Always On feature that allows users to configure modem to remember the system's security password; and Port Forwarding that allows users to safely play gaming applications over the Internet while their local network remains secure.

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