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電腦怎么看端口是否被占用 電腦怎么看端口關閉情況

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電腦怎么看端口是否被占用 電腦怎么看端口關閉情況

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1. netstat命令簡介
Netstat 命令用于顯示各種網絡相關信息，如網絡連接，路由表，接口狀態 (Interface Statistics)，masquerade 連接，多播成員 (Multicast Memberships) 等等 。
netstat命令簡介
2. 查看netstat 所有狀態
[[email protected] ~]# netstat -aActive Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 my_public_ip:9016 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9017 0.0.0.0:* LISTEN
tcp 0 0 localhost:smtp 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9018 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:pptp 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9019 0.0.0.0:* LISTEN
3. 查看所有TCP連接
[[email protected] ~]# netstat -atActive Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 my_public_ip:9016 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9017 0.0.0.0:* LISTEN
tcp 0 0 localhost:smtp 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9018 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:pptp 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9019 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:tambora 0.0.0.0:* LISTEN
tcp 0 0 my_public:etlservicemgr 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:dynamid 0.0.0.0:* LISTEN
tcp 0 0 my_public_ip:9003 0.0.0.0:* LISTEN
4. 禁用反向域名解析，加快查詢速度
[[email protected] ~]# netstat -anttcp 0 0 113.105.164.151:42342 202.46.36.30:9001 CLOSE_WAIT
tcp 0 0 113.105.164.151:49472 202.46.36.30:9001 ESTABLISHED
tcp 0 0 113.105.164.151:43470 202.46.36.30:9001 CLOSE_WAIT
tcp 0 0 113.105.164.151:43576 202.46.36.30:9001 CLOSE_WAIT
tcp 0 0 113.105.164.151:9001 120.84.140.61:6290 FIN_WAIT2
tcp 0 0 113.105.164.151:9015 183.14.29.69:6809 FIN_WAIT2
tcp 0 0 113.105.164.151:35424 202.46.36.30:9002 CLOSE_WAIT
tcp 0 0 113.105.164.151:38074 202.46.36.30:9001 CLOSE_WAIT
tcp 0 0 113.105.164.151:9001 118.112.75.246:2710 FIN_WAIT2
tcp 0 0 113.105.164.151:45124 202.46.36.30:9001 CLOSE_WAIT
tcp 0 0 113.105.164.151:37202 202.46.36.30:9001 CLOSE_WAIT
tcp 0 0 113.105.164.151:52640 202.46.36.30:9001 CLOSE_WAIT
5. 持續刷新信息
我們可以使用 netstat 的 -c 選項持續輸出信息 。
[[email protected] ~]# netstat -ct6. 常見用法
6.1 查看所有TCP監聽端口
[[email protected] ~]# netstat -lntp
linux查看所有TCP監聽端口
6.2 查看所有的TCP連接情況
[[email protected] ~]# netstat -antp6.3 查看所有UDP連接情況
[[email protected] ~]# netstat -anp |sed -n '2p;/^udp/p'6.4 查看所有已經建立的TCP連接
[[email protected] ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p'
linux查看所有已經建立的TCP連接
6.5 查看系統當前TCP連接數:
[[email protected] ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p' |wc -l6.6 查看TCP半開連接,正常情況下,應該看不到有數據
[[email protected] ~]# netstat -nap | grep SYN_RECV6.7 查看TCP半開連接數,正常情況下應該為0
[[email protected] ~]# netstat -nap | grep SYN_RECV |wc -l6.8 查看網絡統計信息
【電腦怎么看端口是否被占用 電腦怎么看端口關閉情況】[[email protected] ~]# netstat -s