Ping is done in packets and as such requires a connection to update, just like other types of traffic. In other words, if a connection drops intermittently, the game's ping function will be affected just like the game or anything else utilizing the constant connection. If his connection drops and stays out for a couple seconds, then reconnects, it won't necessarily change his ping rate on screen because the ping packets got dropped just like all the other traffic. Judging by how renegade handles player and vehicle movement in this scenario, it likely displays the last successful ping until it receives the next ping reply from another one and updates the value. Just a guess (but I do have a networking degree ).