vim /etc/sysctl.conf 

短连接

net.ipv4.tcp_syncookies=1

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_fin_timeout = 6

net.ipv4.tcp_keepalive_time = 1800

net.ipv4.ip_local_port_range = 10240 65000

net.ipv4.tcp_max_syn_backlog = 131072

长连接

net.ipv4.tcp_syncookies= 1

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 0

net.ipv4.tcp_fin_timeout = 15

net.ipv4.tcp_keepalive_time = 30

net.ipv4.tcp_keepalive_probes = 2

net.ipv4.tcp_keepalive_intvl = 2

net.ipv4.ip_local_port_range = 10240 65000

net.ipv4.tcp_max_syn_backlog = 131072

 

执行

sysctl -p