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Jelly Bean · 21-08-2008, 01:09

Double port forwarding
Double port forwarding can be done on a network with multiple routers. From the first router, ports from the public IP address are forwarded to another router/gateway's external IP address which in turn forwards them on to a host on the private network. [1]

Reverse port forwarding
Reverse port forwarding, or reverse port tunnelling, is done by two components, usually software-based, where one component acts as a session-server - listening on a session-port, while the other component acts as a session-client to the session-server component - connecting to the session-server. After a session is established, the session-server will often listen on (accept connections on) a port that is to be forwarded, and when a connection is made to this port, the connection traffic will be forwarded to the session-client (through the session-connection that was previously initiated by the session-client), usually with a destination of the session-client machine or another machine accessible from the session-client. A common situation where this type of forwarding is used is where a port needs to be accessed that is on a machine located behind a gateway/router or firewall that is not configurable by those wanting to access that port. This functionality is built-in to some implementations of SSH (Secure Shell), and there are also software systems available that are designed more specifically for this type of forwarding.

21-08-2008, 01:09	#3
Jelly Bean Inactive Join Date: May 2008 Location: Wales. Services: Virginmedia Posts: 167	Re: Cable router Help Double port forwarding Double port forwarding can be done on a network with multiple routers. From the first router, ports from the public IP address are forwarded to another router/gateway's external IP address which in turn forwards them on to a host on the private network. [1] Reverse port forwarding Reverse port forwarding, or reverse port tunnelling, is done by two components, usually software-based, where one component acts as a session-server - listening on a session-port, while the other component acts as a session-client to the session-server component - connecting to the session-server. After a session is established, the session-server will often listen on (accept connections on) a port that is to be forwarded, and when a connection is made to this port, the connection traffic will be forwarded to the session-client (through the session-connection that was previously initiated by the session-client), usually with a destination of the session-client machine or another machine accessible from the session-client. A common situation where this type of forwarding is used is where a port needs to be accessed that is on a machine located behind a gateway/router or firewall that is not configurable by those wanting to access that port. This functionality is built-in to some implementations of SSH (Secure Shell), and there are also software systems available that are designed more specifically for this type of forwarding.