NETGEAR DOCSIS C6230 User Manual page 96

IP address with your computer's IP address and forwards the message to your
computer.
8. When you finish your chat session, your cable modem router eventually senses a
period of inactivity in the communications. The cable modem router then removes
the session information from its session table, and incoming traffic is no longer
accepted on port numbers 33333 or 113.
Specify Internet Port Settings
C6230 WiFi Cable Modem Router
96 User Manual