kernel.panic=3
net.ipv4.conf.default.arp_ignore=1
net.ipv4.conf.all.arp_ignore=1
net.ipv4.ip_forward=1
net.ipv4.icmp_echo_ignore_broadcasts=1
net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.tcp_ecn=1 
net.ipv4.tcp_fin_timeout=30
net.ipv4.tcp_keepalive_time=120
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_timestamps=0
net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=3600                    
net.ipv4.netfilter.ip_conntrack_udp_timeout=60                                  
net.ipv4.netfilter.ip_conntrack_udp_timeout_stream=180                          
net.ipv6.conf.all.forwarding=1