net.ipv4.tcp_fin_timeout=2

net.ipv4.tcp_tw_reuse=1

net.ipv4.tcp_tw_recycle=1

net.ipv4.tcp_syncookies=1

net.ipv4.tcp_keepalive_time=600

net.ipv4.ip_local_port_range=4000 65000

net.ipv4.tcp_max_syn_backlog=16384

net.ipv4.route.gc_timeout=100

net.ipv4.tcp_syn_retries=1

net.ipv4.tcp_synack_retries=1

net.core.somaxconn=16384

net.core.netdev_max_backlog=16384

net.ipv4.tcp_max_orphans=16384

#以下参数是对iptables防火墙的优化，防火墙不开会提示，可以忽略不理

net.nf_conntrack_max=25000000

net.netfilter.nf_conntrack_max=25000000

net.netfilter.nf_conntrack_tcp_timeout_established=180

net.netfilter.nf_conntrack_tcp_timeout_time_wait=120

net.netfilter.nf_conntrack_tcp_timeout_close_wait=60

net.netfilter.nf_conntrack_tcp_timeout_fin_wait=120