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Netgear Orbi RBK53S Manual

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Customize Internet Traffic Rules for Ports
118
Orbi WiFi System
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 observing the destination port number of 6667, your
router creates another session entry to send any incoming port 113 traf
fic 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. The IRC server also 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 1
13 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 traf
fic is no longer accepted on port numbers 33333 or 113.
… 118 …


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