如何测试服务器端口通不通

Posted 董俊杰

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了如何测试服务器端口通不通相关的知识,希望对你有一定的参考价值。

经常会遇到测试服务器端口通不通的情况,在window上常用的是Telnet,不过Linux下Telnet是需要安装的.

 

一般情况下使用"telnet ip port"判断端口通不通,其实不止这一种,还有很多种方法:

准备环境

启动一个web服务器,提供端口.

1
2
[[email protected] ~]$ 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
[[email protected] ~]# telnet 10.0.250.3 80
Trying 10.0.250.3...
telnet: connect to address 10.0.250.3: Connection refused #直接提示连接被拒绝

2)再连接存在的端口

1
2
3
4
5
6
7
8
[[email protected] ~]# 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 [email protected]

-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
[[email protected] ~]# ssh 10.0.250.3 -p 80
ssh: connect to host 10.0.250.3 port 80: Connection refused
[[email protected] ~]# 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
6
7
8
9
10
11
12
13
14
15
16
17
18
19
[[email protected] ~]# ssh ... -p
a
^]
^C
[[email protected] ~]# 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
[[email protected] ~]# wget ...:
---- ::-- http://.../
Connecting to ...:... failed: Connection refused.

2)连接存在的端口

1
2
3
4
[[email protected] ~]# wget ...:
---- ::-- http://...:/
Connecting to ...:... connected.
HTTP request sent, awaiting response...

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
[[email protected] ~]# 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
[[email protected] ~]# 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
[[email protected] ~]# 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

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. 遵循这两点可以找到很多工具.

一般在windows下使用telnet比较方便,linux 下wget  ssh 比较方便些.

 

转自 https://www.jb51.net/article/78082.htm

以上是关于如何测试服务器端口通不通的主要内容,如果未能解决你的问题,请参考以下文章

如何测试某个端口通不通如何测试

如何在路由器上测试远端UDP端口通不通

请问怎么测试外网IP的某个端口通不通?

Windows 技术篇-利用telnet方法ping端口通不通实例演示,如何测试服务器端口是否启用,windows启用telnet功能

linux 测试端口通不通(四种方法)

linux下如何测试一个IP地址的某个端口通不通