linux 端口占用檢視_Linux怎麼檢視被占用的端口

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1. netstat指令簡介

Netstat 指令用于顯示各種網絡相關資訊，如網絡連接配接，路由表，接口狀态 (Interface Statistics)，masquerade 連接配接，多點傳播成員 (Multicast Memberships) 等等。

netstat指令簡介

2. 檢視netstat 所有狀态

[[email protected] ~]# netstat -a
           

Active 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. 檢視所有TCP連接配接

[[email protected] ~]# netstat -at
           

Active 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 -ant
           

tcp 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. 持續重新整理資訊

我們可以使用 netstat 的 -c 選項持續輸出資訊。

[[email protected] ~]# netstat -ct
           

6. 常見用法

6.1 檢視所有TCP監聽端口

[[email protected] ~]# netstat -lntp
           

linux檢視所有TCP監聽端口

6.2 檢視所有的TCP連接配接情況

[[email protected] ~]# netstat -antp
           

6.3 檢視所有UDP連接配接情況

[[email protected] ~]# netstat -anp |sed -n '2p;/^udp/p'
           

6.4 檢視所有已經建立的TCP連接配接

[[email protected] ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p'
           

linux檢視所有已經建立的TCP連接配接

6.5 檢視系統目前TCP連接配接數:

[[email protected] ~]# netstat -antp |sed -n '2p;/ESTABLISHED/p' |wc -l
           

6.6 檢視TCP半開連接配接,正常情況下,應該看不到有資料

[[email protected] ~]# netstat -nap | grep SYN_RECV
           

6.7 檢視TCP半開連接配接數,正常情況下應該為0

[[email protected] ~]# netstat -nap | grep SYN_RECV |wc -l
           

6.8 檢視網絡統計資訊

[[email protected] ~]# netstat -s