tcp_keepalive_probes the number of unacknowledged probes to send before considering the connection dead and notifying the application layer source : www.tldp.org $cat /proc/sys/net/ipv4/tcp_keepalive_probes 9 $ trunk/os/ip/tcp.c – 7 identical 2436: /* Compute usable segment based on offered window and limit 2437: * window probes to one 2438: */ 3064: return tcphangup(c); 3065: if(n >= 1 …