Bedienungsanleitung Netgear Nighthawk Pro Gaming XR300 (Seite 187 von 202) (Englisch)

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Application Example: Port Triggering for Internet Relay

Chat

Some application servers, such as FTP and IRC servers, send replies to multiple port

numbers. Using port triggering, you can tell the router to open more incoming ports

when a particular outgoing port starts a session.

An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at

destination port 6667. The IRC server not only responds to your originating source port

but also sends an “identify” message to your computer on port 113. Using port triggering,

you can tell the router, “When you initiate a session with destination port 6667, you must

also allow incoming traffic on port 113 to reach the originating computer.” The following

sequence shows the effects of this port triggering rule:

1. You open an IRC client program to start a chat session on your computer.

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.

Noting your port triggering rule and observing the destination port number of 6667,

your router creates another 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 (for example, port 33333) as the destination port and sends an “identify” message

to your router with destination port 113.

6. When your router receives the incoming message to destination port 33333, it checks

its session table to see if a session is active 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. When your router receives the incoming message to destination port 113, it checks

its session table and finds 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.

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.

User Manual187Manage and Customize Internet

Traffic Rules for Ports

Nighthawk Pro Gaming Router

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