NETGEAR Nighthawk Pro XR1000 User Manual page 218

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.
Manage and Customize Internet
Traffic Rules for Ports
Nighthawk Pro Gaming Router Model XR1000
218 User Manual