# vi /etc/sysctl
net.ipv4.tcp_syncookies = 1 # 可防止syn攻擊,預設為1 net.ipv4.tcp_tw_reuse = 1 # 允許將time-wait sockets重新用於新的tcp連線上,預設為0 net.ipv4.tcp_tw_recycle = 1 # 允許快速回收,預設為0 net.ipv4.tcp_fin_timeout = 30 # timeout 時間,預設為60
#sysctl -p
或者
sysctl -w net.ipv4.tcp_syncookies=1 sysctl -w net.ipv4.tcp_tw_reuse=1 sysctl -w net.ipv4.tcp_tw_recycle=1 sysctl -w net.ipv4.tcp_fin_timeout=30
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