lpcm1536

杜比视界
@lpcm1536 V2 [ 普通会员 ]

第 26 号会员,加入于 2022-09-30 。

  • lpcm1536 最近回复了
  • 2个月前 回复了 mayan35 的主题 › 请问如何判断一个服务器的IP的端口是否开放?
  • 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,具体内容请往下看: 准备环境 启动一个web服务器,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

    [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...

    4、使用端口扫描工具

    [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
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