NETGEAR Orbi Pro WiFi 6 AX6000 User Manual page 200

Orbi Pro WiFi 6 AX6000 Router Model SXR80 and Orbi Pro WiFi 6 AX6000 Satellite Model SXS80
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.
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 traffic is no longer accepted on port numbers 33333 or
113.
Customize Internet Traffic Rules
for Ports
200 User Manual