AC1200 WiFi DSL Modem Router—Essentials Edition Model D6100

7.When your modem 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 modem 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 modem router eventually senses a period of inactivity in the communications. The modem router then removes the session information from its session table, and incoming traffic is no longer accepted on port numbers 33333 or 113.

Manage Firewall Rules, Port Forwarding, and Port Triggering

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NETGEAR user manual AC1200 WiFi DSL Modem Router-Essentials Edition Model D6100