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如何測(cè)試端口通不通(四種方法）

 更新時(shí)間：2016年01月14日 17:02:35   投稿：mrr  
一般情況下使用"telnet ip port"判斷端口通不通.接下來(lái)通過(guò)本文給大家分享四種方法測(cè)試端口通不通，感興趣的朋友一起學(xué)習(xí)吧

一般情況下使用"telnet ip port"判斷端口通不通，其實(shí)測(cè)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(nèi)容請(qǐng)往下看：

準(zhǔn)備環(huán)境

啟動(dòng)一個(gè)web服務(wù)器，提供端口.

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

用其它web服務(wù)器提供端口也一樣，由于python比較方便，這里就用它

1、使用telnet判斷

telnet是windows標(biāo)準(zhǔn)服務(wù)，可以直接用；如果是linux機(jī)器，需要安裝telnet.

用法: telnet ip port

1）先用telnet連接不存在的端口

[root@localhost ~]# telnet 10.0.250.3 80
Trying 10.0.250.3...
telnet: connect to address 10.0.250.3: Connection refused #直接提示連接被拒絕

2）再連接存在的端口

[root@localhost ~]# telnet localhost 22
Trying ::1...
Connected to localhost. #看到Connected就連接成功了
Escape character is '^]'.
SSH-2.0-OpenSSH_5.3
a
Protocol mismatch.
Connection closed by foreign host.

2、使用ssh判斷

ssh是linux的標(biāo)準(zhǔn)配置并且最常用，可以用來(lái)判斷端口嗎？

用法: ssh -v -p port username@ip

-v 調(diào)試模式(會(huì)打印日志).

-p 指定端口

username可以隨意

1）連接不存在端口

[root@localhost ~]# ssh 10.0.250.3 -p 80
ssh: connect to host 10.0.250.3 port 80: Connection refused
[root@localhost ~]# ssh 10.0.250.3 -p 80 -v
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: 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 refused
ssh: connect to host 10.0.250.3 port 80: Connection refused

2）連接存在的端口

[root@localhost ~]# ssh ... -p 
a
^]
^C
[root@localhost ~]# ssh ... -p -v
OpenSSH_.p, OpenSSL ..e-fips Feb 
debug: Reading configuration data /etc/ssh/ssh_config
debug: 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(xiàng)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）連接不存在的端口

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

2）連接存在的端口

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

4、使用端口掃描工具

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

總結(jié)

提供端口服務(wù)，則使用了tcp協(xié)議，上面是以web服務(wù)器為例。如果服務(wù)器是更簡(jiǎn)單的tcp服務(wù)器，三個(gè)工具同樣適用.

三個(gè)工具的共同點(diǎn)是：1.以tcp協(xié)議為基礎(chǔ)；2.能訪問指定端口. 遵循這兩點(diǎn)可以找到很多工具.

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

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