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5.
The IRC server sends a return message to your gateway using the NAT-assigned source
port (for example, port 33333) as the destination port and sends an "identify" message to
your gateway with destination port 113.
6.
When your gateway 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 gateway restores the original address information replaced by NAT and sends this reply
message to your computer.
7.
When your gateway 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
gateway 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 gateway eventually senses a period of inactivity in
the communications and removes the session information from its session table, and
incoming traffic is no longer accepted on port numbers 33333 or 113.
Dual Band Wireless VDSL2 + Ethernet Gateway
Control Internet Access
52
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