检测端口通不通linux

1. linux下如何测试一个IP地址的某个端口通不通

在确定防火墙和selinux已经关闭的情况下，使用命令：telnet ip 端口
如果端口不通会有提示

2. 两台linux服务器端口不通怎么解决

准备环境

启动一个web服务器，提供端口.

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[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

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[root@localhost ~]# telnet 10.0.250.3 80
Trying 10.0.250.3...
telnet: connect to address 10.0.250.3: Connection refused #直接提示连接被拒绝

2）再连接存在的端口

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[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

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[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

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[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

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

2）连接存在的端口

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

4、使用端口扫描工具

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[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

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下个人就比较喜欢用wget.

3. Linux下怎样查看某一端口是否开放

可以用nmap工具进行检测端口是否开放。

1：nmap工具检测开放端口

拓展资料

nmap是一个网络连接端扫描软件，用来扫描网上电脑开放的网络连接端。确定哪些服务运行在哪些连接端，并且推断计算机运行哪个操作系统（这是亦称 fingerprinting）。它是网络管理员必用的软件之一，以及用以评估网络系统安全。

正如大多数被用于网络安全的工具，nmap 也是不少黑客及骇客（又称脚本小子）爱用的工具 。系统管理员可以利用nmap来探测工作环境中未经批准使用的服务器，但是黑客会利用nmap来搜集目标电脑的网络设定，从而计划攻击的方法。

Nmap 常被跟评估系统漏洞软件Nessus混为一谈。Nmap 以隐秘的手法，避开闯入检测系统的监视，并尽可能不影响目标系统的日常操作。

4. 判断端口通不通的几种方法

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
[root@localhost ~]# telnet 10.0.250.3 80
Trying 10.0.250.3...
telnet: connect to address 10.0.250.3: Connection refused #直接提示连接被拒绝
2）再连接存在的端口
[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
[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
[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
[root@localhost ~]# wget ...:
---- ::-- http://.../
Connecting to ...:... failed: Connection refused.
2）连接存在的端口
[root@localhost ~]# wget ...:
---- ::-- http://...:/
Connecting to ...:... connected.
HTTP request sent, awaiting response...

5. Linux下，不用telnet命令，还有别的命令可以测试端口是否开放吗

可以用python的socket模块，比telnet快多了。下面是我测试过的代码，楼主可以参考一下：

#!/usr/local/bin/python

#nameIsOpen.py

importos

importsys

importsocket

#firstargument

host=sys.argv[1]

#secondargument

port=int(sys.argv[2])

#sockettryconnect

defIsOpen(ip,port):

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)

try:

s.connect((ip,port))

s.shutdown(2)

print('IP%s,port%disopen'%(ip,port))

returnTrue

except:

print('IP%s,port%disdown'%(ip,port))

returnFalse

if__name__=='__main__':

6. 如何测试端口通不通

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
[root@localhost ~]# telnet 10.0.250.3 80
Trying 10.0.250.3...
telnet: connect to address 10.0.250.3: Connection refused #直接提示连接被拒绝

2）再连接存在的端口
[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
[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
[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
[root@localhost ~]# wget ...:
---- ::-- http://.../
Connecting to ...:... failed: Connection refused.

2）连接存在的端口
[root@localhost ~]# wget ...:
---- ::-- http://...:/
Connecting to ...:... connected.
HTTP request sent, awaiting response...

7. Linux系统下怎么测试端口的连通性

可以使用nc命令测试。

例如测试一下 某个个IP 的80 端口有没有开启可以内使用命令：容nc -z -w 1 “IP地址” 80

8. linux检测端口通不通

ping能检查IP检查端口啊 ------解决--------------------------------------------------------TCP telnet 102.106.228.173 8601即 ------解决--------------------------------------------------------探讨引用: TCP telnet 102.106.228.173 8601即没命令啊------解决--------------------------------------------------------探讨引用:引用:TCP ------解决--------------------------------------------------------没装telnet 客户端 ------解决-------------------------------------------------------- = = 尝试用c语言写程序建立链接看 nmap些工具 ------解决--------------------------------------------------------netstat -an grep 8601 ------解决--------------------------------------------------------、、哦、、看用端口

9. linux下怎么测试一个IP地址的某个端口通不通

ping只能检查IP，无法检查端口啊 ------解决的方法--------------------------------------------------------如果是TCP的 telnet 102.106.228.173 8601即可 ------解决的方法--------------------------------------------------------探讨引用: 如果是TCP的 telnet 102.106.228.173 8601即可没这命令啊------解决的方法--------------------------------------------------------探讨引用:引用:如果是TCP的 ------解决的方法--------------------------------------------------------没有就装一个telnet 客户端就可以了 ------解决的方法-------------------------------------------------------- = =！ 可以尝试用c语言写一个小程序建立链接看可以不 还有nmap这些工具了 ------解决的方法--------------------------------------------------------netstat -an | grep 8601 ------解决的方法--------------------------------------------------------、、哦、、不是，那是看正在用的端口。。。