netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'
SYN_RECV 266
TIME_WAIT 25331
ESTABLISHED 905
FIN_WAIT1 720
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_sack = 0
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 65536
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 30
net.ipv4.ip_local_port_range = 1024 65535
上这些参数加入/etc/sysctl.conf,执行：
sudo sysctl -p
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