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====== Port Forwarding ====== ===== Motivation ===== {{INLINETOC 2 5 }} {{:portf-schematic.png?nolink&500}} Suppose you have a local network, and you have two web servers on the network, Web Server 1 on 192.168.1.10 and Web Server 2 on 192.168.1.20. Suppose you also want an external client to be able to connect to //either// of these servers. Only one IP is associated with the network, the external IP of the router: 1.2.3.4 in the schematic above. In order for a client to be able to communicate with both web servers, we can //forward// a port on the router to port 80 on Web Server 1 and //forward// a different port on the router to port 80 Web Server 2. So, we might forward port 8001 on the router to Port 80 on Web Server 1 and 8002 on the router to Port 80 on Web Server 2. This way, the external client could connect to Web Server 1 at http://1.2.3.4:8001/ and Web Server 2 at http://1.2.3.4:8002/ ===== Individual Port Forwarding ===== {{:portf-i.png?nolink}} These options let you forward a single port from the router to a host on the local network. The options are: * **Description:** A description of this forward. This is just a label for the rule, it doesn't affect how the forward functions, and is optional. * **Protocol:** Whether to forward TCP packets, UDP packets or Both. * **From Port:** The external port (on the WAN interface of the router) to forward to the host on the local network. * **To IP:** The IP address of the host on the local network to which you want to forward the port * **To Port:** The port on the local host to which you are forwarding traffic. If unspecified, this is assumed to be the same as the //From Port// ===== Port Range Forwarding ===== These options let you forward a range of ports to a single local host. The source port range and the destination port range are the same. The options are: * **Description:** A description of this forward. This is just a label for the rule, it doesn't affect how the forward functions, and is optional. * **Protocol:** Whether to forward TCP packets, UDP packets or Both. * **Start Port:** The first (lowest) port in the port range being forwarded * **End Port:** The last (highest) port in the port range being forwarded * **To IP:** The IP address of the host on the local network to which you want to forward this range of ports {{:portf-r.png?nolink}} ===== DMZ ===== {{:portf-dmz.png?nolink}} When a DMZ (De-Militarized Zone) is configured, all ports not specifically used by the router or forwarded to other hosts are forwarded to one specific host on the local network. This can include a lot of hostile traffic, so only activate this option if this host has a firewall configured. ===== UPnP / NAT-PMP ===== {{:portf-upnp.png?nolink}} UPnP is a protocol that allows hosts to dynamically open and forward ports. Since this can pose a security risk, it is disabled by default. However, some applications require UPnP. Think carefully before enabling UPnP.

port_forwarding.1344634432.txt.gz · Last modified: 2012/08/10 21:33 by eric
 
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