测试端⼝是否打开的四种⽅法（转）
add by zhj：没到出处
⼀般情况下使⽤"telnet ip port"判断端⼝通不通，其实测试⽅法不⽌这⼀种，还有很多种⽅法，下⾯⼩编给⼤家分享了⼏种⽅法，具体内容请往下看：
准备环境
启动⼀个web服务器，提供端⼝.
telnet ip 端口号1 2[wyq@localhost ~]$ python -m SimpleHTTPServer 8080 Serving HTTP on 0.0.0.0 port 8080 ...
⽤其它web服务器提供端⼝也⼀样，由于python⽐较⽅便，这⾥就⽤它
1、使⽤telnet判断
telnet是windows标准服务，可以直接⽤；如果是linux机器，需要安装telnet.⽤法: telnet ip port
1）先⽤telnet连接不存在的端⼝
1 2 3[root@localhost ~]# telnet 10.0.250.3 80
Trying 10.0.
telnet: connect to address 10.0.250.3: Connection refused #直接提⽰连接被拒绝
2）再连接存在的端⼝
1 2 3 4 5 6 7 8[root@localhost ~]# telnet localhost 22
Trying ::1...
Connected to localhost. #看到Connected就连接成功了Escape character is '^]'.
SSH-2.0-OpenSSH_5.3
a
Protocol mismatch.
Connection closed by foreign host.
2、使⽤ssh判断
ssh是linux的标准配置并且最常⽤，可以⽤来判断端⼝吗？⽤法: ssh -v -p port username@ip
-v 调试模式(会打印⽇志).
-p 指定端⼝
username可以随意
1）连接不存在端⼝
1 2 3 4 5 6 7 8 9[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）连接存在的端⼝1
2 3 4 5[root@localhost ~]# ssh ... -p a
^]
^C
[root@localhost ~]# ssh ... -p -v
6 7 8 9 10 11 12 13 14 15 16 17 18 19OpenSSH_.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选项也可以咯
3、使⽤wget判断
wget是linux下的下载⼯具，需要先安装.⽤法: wget ip:port
1）连接不存在的端⼝
1 2 3[root@localhost ~]# wget ...:
---- ::-- .../
Connecting to ...:... failed: Connection refused.
2）连接存在的端⼝
1 2 3 4[root@localhost ~]# wget ...:
---- ::-- ...:/
Connecting to ...:... connected.
HTTP request sent,
4、使⽤端⼝扫描⼯具1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28[root@localhost ~]# nmap ... -p
Starting Nmap . ( ) at -- : CST
Nmap scan
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 . ( ) at -- : CST
Nmap scan
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 . ( ) at -- : CST
Nmap scan
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
总结
提供端⼝服务，则使⽤了tcp协议，上⾯是以web服务器为例。如果服务器是更简单的tcp服务器，三个⼯具同样适⽤.
三个⼯具的共同点是：1.以tcp协议为基础；2.能访问指定端⼝. 遵循这两点可以到很多⼯具.⼀般在windows下使⽤telnet⽐较⽅便，linux下个⼈就⽐较喜欢⽤wget.

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