如何測試連接埠通不通(四種方法）_linux shell

一般情況下使用"telnet ip port"判斷連接埠通不通，其實測試方法不止這一種，還有很多種方法，下面小編給大家分享了幾種方法，具體內容請往下看：

準備環境

啟動一個web伺服器，提供連接埠.

[wyq@localhost ~]$ python -m SimpleHTTPServer 8080Serving HTTP on 0.0.0.0 port 8080 ...

用其它web伺服器提供連接埠也一樣，由於python比較方便，這裡就用它

1、使用telnet判斷

telnet是windows標準服務，可以直接用；如果是linux機器，需要安裝telnet.

用法: telnet ip port

1）先用telnet串連不存在的連接埠

[root@localhost ~]# telnet 10.0.250.3 80Trying 10.0.250.3...telnet: connect to address 10.0.250.3: Connection refused #直接提示串連被拒絕

2）再串連存在的連接埠

[root@localhost ~]# telnet localhost 22Trying ::1...Connected to localhost. #看到Connected就串連成功了Escape character is '^]'.SSH-2.0-OpenSSH_5.3aProtocol mismatch.Connection closed by foreign host.

2、使用ssh判斷

ssh是linux的標準配置並且最常用，可以用來判斷連接埠嗎？

用法: ssh -v -p port username@ip

-v 偵錯模式(會列印日誌).

-p 指定連接埠

username可以隨意

1）串連不存在連接埠

[root@localhost ~]# ssh 10.0.250.3 -p 80ssh: connect to host 10.0.250.3 port 80: Connection refused[root@localhost ~]# ssh 10.0.250.3 -p 80 -vOpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013debug1: Reading configuration data /etc/ssh/ssh_configdebug1: Applying options for *debug1: Connecting to 10.0.250.3 [10.0.250.3] port 80.debug1: connect to address 10.0.250.3 port 80: Connection refusedssh: connect to host 10.0.250.3 port 80: Connection refused

2）串連存在的連接埠

[root@localhost ~]# ssh ... -p a^]^C[root@localhost ~]# ssh ... -p -vOpenSSH_.p, OpenSSL ..e-fips Feb debug: Reading configuration data /etc/ssh/ssh_configdebug: Applying options for *debug: Connecting to ... [...] port .debug: Connection established.debug: permanently_set_uid: /debug: identity file /root/.ssh/identity type -debug: identity file /root/.ssh/identity-cert type -debug: identity file /root/.ssh/id_rsa type -debug: identity file /root/.ssh/id_rsa-cert type -debug: identity file /root/.ssh/id_dsa type -debug: identity file /root/.ssh/id_dsa-cert type -a^C

不用-v選項也可以咯

3、使用wget判斷

wget是linux下的下載工具，需要先安裝.

用法: wget ip:port

1）串連不存在的連接埠

[root@localhost ~]# wget ...:---- ::-- http://.../Connecting to ...:... failed: Connection refused.

2）串連存在的連接埠

[root@localhost ~]# wget ...:---- ::-- http://...:/Connecting to ...:... connected.HTTP request sent, awaiting response...

4、使用連接埠掃描工具

[root@localhost ~]# nmap ... -p Starting Nmap . ( http://nmap.org ) at -- : CSTNmap scan report for ...Host is up (.s latency).PORT STATE SERVICE/tcp closed httpMAC Address: B:A::CF:FD:D (Unknown)Nmap done: IP address ( host up) scanned in . seconds[root@localhost ~]# nmap ... -p Starting Nmap . ( http://nmap.org ) at -- : CSTNmap scan report for ...Host is up (.s latency).PORT STATE SERVICE/tcp open http-proxyMAC Address: B:A::CF:FD:D (Unknown)Nmap done: IP address ( host up) scanned in . seconds[root@localhost ~]# nmap ...Starting Nmap . ( http://nmap.org ) at -- : CSTNmap scan report for ...Host is up (.s latency).Not shown: closed portsPORT STATE SERVICE/tcp open ssh/tcp open rpcbind/tcp open http-proxy/tcp open unknownMAC Address: B:A::CF:FD:D (Unknown)Nmap done: IP address ( host up) scanned in . seconds

總結

提供連接埠服務，則使用了tcp協議，上面是以web伺服器為例。如果伺服器是更簡單的tcp伺服器，三個工具同樣適用.

三個工具的共同點是：1.以tcp協議為基礎；2.能訪問指定連接埠. 遵循這兩點可以找到很多工具.

一般在windows下使用telnet比較方便，linux下個人就比較喜歡用wget.