不使用telnet进行端口测试的方法 没有 telnet 有大用 有大大用

# 测试命令及参数
curl -v 10.10.251.132:22

# 端口连通示例
[oracle@dbtest ~]$ curl -v 10.10.251.132:22
* About to connect() to 10.10.251.132 port 22 (#0)
*   Trying 10.10.251.132...
* Connected to 10.10.251.132 (10.10.251.132) port 22 (#0)           <<<<<<<
> GET / HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 10.10.251.132:22
> Accept: */*
> 
SSH-2.0-OpenSSH_7.4
Protocol mismatch.
* Recv failure: Connection reset by peer
* Closing connection 0
curl: (56) Recv failure: Connection reset by peer

# 端口未连通示例
[oracle@dbtest ~]$ curl -v 10.10.251.132:2222
* About to connect() to 10.10.251.132 port 2222 (#0)
*   Trying 10.10.251.132...
* Connection refused        <<<<<<<               
* Failed connect to 10.10.251.132:2222; Connection refused
* Closing connection 0
curl: (7) Failed connect to 10.10.251.132:2222; Connection refused

# IP地址错误或者防火墙限制示例
[oracle@dbtest ~]$ curl -v 10.10.251.220:22
* About to connect() to 10.10.251.220 port 22 (#0)
*   Trying 10.10.251.220...
* No route to host          <<<<<<<
* Failed connect to 10.10.251.220:22; No route to host
* Closing connection 0
curl: (7) Failed connect to 10.10.251.220:22; No route to host

# 测试命令及参数
ssh -v -p 22 root@10.10.251.132

# 端口连通示例
[root@dbtest ~]# ssh -v -p 22 root@10.10.251.132
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /root/.ssh/config
debug1: /root/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to 10.10.251.132 [10.10.251.132] port 22.        <<<<<<<
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
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 10.10.251.132:22 as 'root'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:YJD4VRC6wUMHaF1BMW78xPAz5gek40IrRC/lAFH3Eao
debug1: Host '10.10.251.132' is known and matches the ECDSA host key.
debug1: Found key in /root/.ssh/known_hosts:2
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:0)
debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:0)
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /root/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Trying private key: /root/.ssh/id_ecdsa
debug1: Trying private key: /root/.ssh/id_ed25519
debug1: Next authentication method: password
root@10.10.251.132's password: 

# 端口未连通示例
[root@dbtest ~]# ssh -v -p 222 root@10.10.251.132
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /root/.ssh/config
debug1: /root/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to 10.10.251.132 [10.10.251.132] port 222.
debug1: connect to address 10.10.251.132 port 222: Connection refused       <<<<<<<
ssh: connect to host 10.10.251.132 port 222: Connection refused

# IP地址错误或者防火墙限制示例
[root@dbtest ~]# ssh -v -p 22 root@10.10.251.220
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /root/.ssh/config
debug1: /root/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to 10.10.251.220 [10.10.251.220] port 22.
debug1: connect to address 10.10.251.220 port 22: No route to host            <<<<<<
ssh: connect to host 10.10.251.220 port 22: No route to host