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Netgear JR6150 Manual

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A750 Wireless Dual Band Gigabit Router JR6150
Note: Only one computer at a time can use the triggered application.
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 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 must access a web server running on a computer in your local network. Using port
forwarding, you can tell the 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
192.168.1.123.” 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 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 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
router.
2. Your 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 192.168.1.123. Therefore, your router
modifies the destination information in the request message.
The destination address is replaced with 192.168.1.123.
Your router then sends this request message to your local network.
3. Your web server at 192.168.1.123 receives the request and composes a return message
with
the requested web page data. Your web server then sends this reply message to your
router.
4. Your 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 must know which inbound ports the
application needs. You
can usually find this information by contacting the publisher of the application or the relevant
user groups and newsgroups.
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