RE: verifying an open or closed port on an ip address

[Tony Kava <securityfocus () pottcounty com>]

You should check out netcat.  I've never used the Windows version, but the
*nix version is great for scripting because you can check if a port is
'open' (example command: nc -z -n 172.16.0.1 677), and it will return true
or false accordingly.  It would surprise me if the Windows version did not
have the same capability.

Link:

http://www.atstake.com/research/tools/network_utilities

--
Tony Kava
Network Administrator
Pottawattamie County, Iowa



-----Original Message-----
From: ian () kingcon com [mailto:ian () kingcon com]
Sent: Thursday, 07 August, 2003 12:45
To: security-basics () securityfocus com
Subject: verifying an open or closed port on an ip address


Hello,

I am looking for a windows compatible utility or method, preferably command
line, where I can verify whether a port on an ip address is reachable or
not.  I want to be able to do individual ports and not port scans.  Say for
instance I wish to verify that port 677 is closed to traffic on ip address
Ex. 172.16.0.1, I'm looking for a utility that would do something like:

Check 172.16.0.1 port 677

and tell me whether that port was reachable.

So if I have two networks and I use this command from one I can determine
whether a port is reachable on another.  To determine whether a security
measure is failing or not.

There may be a simple way to do this...

Thanks
Ian
:)



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But give an' take's the gospel, an' we'll call the bargain fair, 
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