I am designing action game like quake.. My network design is like this. * use udp * one is host(who create a game), and the others is client. * all client sends his position angles and host is relaying the message the other clients. * host is responsible only for judging getting item(when more than 2 players arguing..). * every 3 seconds host sends keep-alive messgaes to clients to check he is not down. so host can drop the player who abrubtly abnormal(maybe computer is down) I am confused that when host is abruptly down, how??

If client not receive any packet from server, then server is down