Linux测试端口连通性的5种方法
作者：wacpguo
在Linux系统中,测试端口通不通是非常常见的情况之一,比如我们进行网络调试的时候就需要测试验证对应的端口是否正常,那么Linux中测试端口通不通的方法是什么?以下是详细内容介绍
1、curl
（1）curl -v ip:port
[root@localhost ~]# curl -v 192.168.120.15:37777 * About to connect() to 192.168.120.15 port 37777 (#0) * Trying 192.168.120.15... * Connected to 192.168.120.15 (192.168.120.15) port 37777 (#0) > GET / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: 192.168.120.15:37777 > Accept: */* >
（2）curl -kv https://ip:port
[root@localhost ~]# curl -kv https://192.168.12.15:3789 * About to connect() to 192.168.12.15 port 3789 (#0) * Trying 192.168.12.15... * Connected to 192.168.12.15 (192.168.12.15) port 3789 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * skipping SSL peer certificate verification * SSL connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 * Server certificate: * subject: CN=cn.com.ca.d6.agent * start date: 4月 26 03:51:05 2021 GMT * expire date: 4月 26 03:51:05 2041 GMT * common name: cn.com.ca.d6.agent * issuer: CN=cn.com.ca.d6.agent > GET / HTTP/1.1 > User-Agent: curl/7.29.0 > Host: 192.168.12.15:3789 > Accept: */* > < HTTP/1.1 404 < Connection:close < Content-Length:22 < Content-Type:text/html < X-Frame-Options:sameorigin < * Closing connection 0 <html>not found</html>
2、nc
（1）nc -nv ip port
[root@localhost ~]# nc -nv 192.168.12.15 3789 Ncat: Version 7.50 ( https://nmap.org/ncat ) Ncat: Connected to 192.168.12.15:3789. ^C
（2）nc -nvv ip port
[root@localhost ~]# nc -nvv 192.168.12.15 3789 Ncat: Version 7.50 ( https://nmap.org/ncat ) NCAT DEBUG: Using system default trusted CA certificates and those in /usr/share/ncat/ca-bundle.crt. NCAT DEBUG: Unable to load trusted CA certificates from /usr/share/ncat/ca-bundle.crt: error:02001002:system library:fopen:No such file or directory libnsock nsi_new2(): nsi_new (IOD #1) libnsock nsock_connect_tcp(): TCP connection requested to 192.168.12.15:3789 (IOD #1) EID 8 libnsock nsock_trace_handler_callback(): Callback: CONNECT SUCCESS for EID 8 [192.168.12.15:3789] Ncat: Connected to 192.168.12.15:3789. libnsock nsi_new2(): nsi_new (IOD #2) libnsock nsock_read(): Read request from IOD #1 [192.168.12.15:3789] (timeout: -1ms) EID 18 libnsock nsock_readbytes(): Read request for 0 bytes from IOD #2 [peer unspecified] EID 26 ^C
3、ssh
（1）ssh -v -p port username@ip // username任意
[root@localhost ~]# ssh -v -p 3789 root@192.168.12.15 OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 58: Applying options for * debug1: Connecting to 192.168.120.15 [192.168.12.15] port 3789. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /root/.ssh/id_rsa type 1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.4 ^C
4、wget
（1）wget ip:port
[root@localhost ~]# wget 192.168.12.15:3789 --2023-03-25 17:05:20-- http://192.168.12.15:3789/ 正在连接 192.168.120.15:37777... 已连接。 已发出 HTTP 请求，正在等待回应... ^C
5、telnet
（1）telnet ip port
[root@localhost ~]# telnet 192.168.12.15 3789 Trying 192.168.12.15... Connected to 192.168.12.15. Escape character is '^]'. ^CConnection closed by foreign host.
端口通 ！= 业务通
tcp端口通，上面跑的http业务可能不通（代理限制）。
tcp层：nc，ssh，telnet
http层：curl，wget
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