target prot optsourcedestination DROP tcp -- anywhere 22.99.22.111 tcp dpt:ddi-tcp-1 flags:FIN,SYN,RST,PSH,ACK,URG/ACK 客户端设置重传次数,默认为5,修改为3 # sysctl net.ipv4.tcp_synack_retries net.ipv4.tcp_synack_retries = 5 # [root@localhost code]# sysctl -w net.ipv4.tcp_synack_r...