Shulou(Shulou.com)06/03 Report--

1. Nc command

Syntax: nc-z-v-n IPADDRESS port

-z for port scanning only, 0 input and output

-v displays the instruction execution process

-n use the IP address directly, not through the domain name server

[root@shansibleqa] # nc-z-v-n IP 22Ncat: Version 7.50 (https://nmap.org/ncat) Ncat: Connected to IP:22.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds. [root@shansibleqa] # nc-z-v-n IP 587Ncat: Version 7.50 (https://nmap.org/ncat) Ncat: Connected to IP:587.Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.

2. Wget command

Syntax: wget ip:port

If it passes through

[root@shansibleqa] # wget IP:22--2019-12-24 17 wget IP:22--2019 43 wget IP:22--2019 50-http://IP:22/Connecting to IP:22... Connected.HTTP request sent, awaiting response... 200 No headers, assuming HTTP/0.9Length: unspecified

If it doesn't work,

[root@shansibleqa] # wget IP:80--2019-12-24 17 wget IP:80--2019 43 wget IP:80--2019 56-http://IP/Connecting to IP:80... Failed: No route to host.

3. Shell command

Syntax: ssh-v-p port IP

Be able to connect

[root@shansibleqa] # ssh-v-p 80 XX.XX.XX.XXOpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017debug1: Reading configuration data / etc/ssh/ssh_configdebug1: / etc/ssh/ssh_config line 58: Applying options for * debug1: Connecting to XX.XX.XX.XX [XX.XX.XX.XX] port 80.debug1: Connection established.debug1: permanently_set_uid: 0

Can't connect.

[root@shansibleqa] # ssh-v-p 23 XX.XX.XX.XXOpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017debug1: Reading configuration data / etc/ssh/ssh_configdebug1: / etc/ssh/ssh_config line 58: Applying options for * debug1: Connecting to XX.XX.XX.XX [XX.XX.XX.XX] port 23.debug1: connect to address XX.XX.XX.XXport 23: Connection timed outssh: connect to host XX.XX.XX.XXport 23: Connection timed out

4. Curl command

Syntax: curl ip:port

Port communication

[root@shansibleqa ~] # curl ip:22SSH-2.0-OpenSSH_7.4curl: (56) Recv failure: Connection reset by peer

The port is blocked.

[root@shansibleqa ~] # curl ip:443curl: (52) Empty reply from server

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