Bedienungsanleitung Netgear DGN2200Bv4 (Seite 62 von 133) (Englisch)

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N300 Wireless ADSL2+ Modem Router DGN2200v4

Port Forwarding to Permit External Host

Communications

In both of the preceding examples, your computer initiates an application session with a

server computer on the Internet. However, you might need to allow a client computer on the

Internet to initiate a connection to a server computer on your network. Normally, your modem

router ignores any inbound traffic that is not a response to your own outbound traffic. You can

configure exceptions to this default rule by using the port forwarding feature.

A typical application of port forwarding can be shown by reversing the client-server

relationship from the previous web server example. In this case, a remote computer’s

browser needs to access a web server running on a computer in your local network. Using

port forwarding, you can tell the modem router, “When you receive incoming traffic on port 80

(the standard port number for a web server process), forward it to the local computer at

192.168.0.123.” The following sequence shows the effects of the port forwarding rule you

have defined:

1. The user of a remote computer opens a browser and requests a web page from

www.example.com, which resolves to the public IP address of your modem router. The

remote computer composes a web page request message with the following destination

information:

Destination address. The IP address of www.example.com, which is the address of your

modem router.

Destination port number. 80, which is the standard port number for a web server

process.

The remote computer then sends this request message through the Internet to your

modem router.

2. Your modem router receives the request message and looks in its rules table for any rules

covering the disposition of incoming port 80 traffic. Your port forwarding rule specifies that

incoming port 80 traffic should be forwarded to local IP address 192.168.0.123. Therefore,

your modem router modifies the destination information in the request message:

The destination address is replaced with 192.168.0.123.

Your modem router then sends this request message to your local network.

3. Your web server at 192.168.0.123 receives the request and composes a return message

with the requested web page data. Your web server then sends this reply message to your

modem router.

4. Your modem router performs Network Address Translation (NAT) on the source IP address,

and sends this request message through the Internet to the remote computer, which

displays the web page from www.example.com.

To configure port forwarding, you need to know which inbound ports the application needs.

You usually can determine this information by contacting the publisher of the application or

the relevant user groups or news groups.

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