我要评论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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