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Operating Systems AIX Telnet to port
# 1  
Old 01-11-2010
Telnet to port
can some one help me ?

what happens when we telnet to a port ?
example
telnet 192.168.0.xx 1234

where 1234 is a port number

Thank you
# 2  
Old 01-11-2010
You'll have to be more specific on what you want to know. Basically, the telnet command will try to establish a TCP connection to the gives address (IP+Port) using the underlying network stack. What happens afterward depends on the hardware in between, any firewalls and ACLs in effect, and the service listening on the other side (if any).
# 3  
Old 01-11-2010
Telnetting to a particular port rather than the standard port 23 for telnet can be a useful test to see if something is listening on a port, e.g. to see if a machine is running a SSH daemon on port 22 the you do:
Code:
$ telnet localhost 22
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
SSH-2.0-OpenSSH_5.1p1 Debian-6ubuntu2
^]
telnet> quit
Connection closed.
$

Whereas testing to see if my machine (or a remote machine) is serving DNS:
Code:
$ telnet localhost 53
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused
$

in this case the answer is not...
# 4  
Old 01-12-2010
try to run the following command on the DNS Server
Code:
 netstat -an

and check if bind is started and listening on the 53 port number
# 5  
Old 01-12-2010
Running
Code:
$ telnet <remotemachine> netstat

can be useful on machines that have not been hardened.
# 6  
Old 01-12-2010
Thank you
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