Telnet

TELNET (TELecommunication NETwork) is a network protocol used on the Internet or local area network (LAN) connections. It was developed in 1969 beginning with RFC 15 and standardized as IETF STD 8, one of the first Internet standards.

Well, since some of you still have no idea what telnet is, let’s try it out.

We’re going to telnet to 192.220.216.129.

Open up the command prompt,

Start > All Programs > Accessories > Command Prompt

OR

Windows + R (windows key is between Alt and Ctrl on the left hand side)

Type in cmd

Now we should have something like:

Before telnetting, we always need to make sure the host is online. Do this by typing in:

ping 192.220.216.129

You should get something like this:

Pinging 192.220.216.129 with 32 bytes of data:

Reply from 192.220.216.129: bytes=32 time=123ms TTL=50
Reply from 192.220.216.129: bytes=32 time=331ms TTL=50
Reply from 192.220.216.129: bytes=32 time=121ms TTL=50
Reply from 192.220.216.129: bytes=32 time=121ms TTL=50

Ping statistics for 192.220.216.129:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 121ms, Maximum = 331ms, Average = 174ms

If you had written something like ping www.google.com, you would have gotten their I.P address.

On some insecure schools, you can enter a blocked website by using the I.P address of it

Now that we have made sure 192.220.216.129 is online, let’s telnet to it.

Type in

telnet 192.220.216.129 21

If you got nothing, that’s good.

This means the port is dead, and not usable for us. (Or it’s a clever honeypot)

Let’s telnet to the next port.

telnet 192.220.216.129 22

Hopefully, you got something like

SSH-2.0-OpenSSH_3.9p1

Protocol mismatch.

This piece of text gives us some vital information, whoever the I.P address belongs to is running Open SSH 3.9

Theoretically, you could exploit that.

Anyway. That’s my tutorial on telnet, hopefully you learned something.

Until later!

~ by empa7hy on July 5, 2008.