root/etc/sysctl.conf

   1 kernel.panic = 3
   2 net.ipv4.ip_forward = 1
   3 net.ipv4.icmp_echo_ignore_broadcasts = 1
   4 net.ipv4.icmp_ignore_bogus_error_responses = 1
   5 net.ipv4.tcp_fin_timeout = 30
   6 net.ipv4.tcp_keepalive_time = 120
   7 net.ipv4.tcp_timestamps = 0