Manual Netgear JWNR2000v3 (page 84 of 116) (English)

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N300 Wireless Router JWNR2000v3

2. Your IRC client composes a request message to an IRC server using a destination port

number of 6667, the standard port number for an IRC server process. Your computer then

sends this request message to your router.

3. Your router creates an entry in its internal session table describing this communication

session between your computer and the IRC server. Your router stores the original

information, performs Network Address Translation (NAT) on the source address and port,

and sends this request message through the Internet to the IRC server.

4. Noting your port triggering rule and having observed the destination port number of 6667,

your router creates an additional session entry to send any incoming port 113 traffic to your

computer.

5. The IRC server sends a return message to your router using the NAT-assigned source port

(as in the previous example, say port 33333) as the destination port. The IRC server also

sends an “identify” message to your router with destination port 113.

6. Upon receiving the incoming message to destination port 33333, your router checks its

session table to determine whether there is an active session for port number 33333.

Finding an active session, the router restores the original address information replaced by

NAT and sends this reply message to your computer.

7. Upon receiving the incoming message to destination port 113, your router checks its session

table and learns that there is an active session for port 113 associated with your computer.

The router replaces the message’s destination IP address with your computer’s IP address

and forwards the message to your computer.

8. When you finish your chat session, your router eventually senses a period of inactivity in the

communications. The router then removes the session information from its session table,

and incoming traffic is no longer accepted on port numbers 33333 or 113.

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

Also, you need to know the number of the outbound port that will trigger the opening of the

inbound ports. You can usually determine this information by contacting the publisher of the

application or relevant user groups or news groups.

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 needs to 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

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Netgear JWNR2000v3 Manual

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