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

From: Birl <sbirl(at)temple.edu>
Date: Sat Aug 09 2003 - 13:30:45 EDT

As it was written on Aug 7, thus ian@kingcon.com spake unto security-basics...:

Ian:  Date: Thu, 7 Aug 2003 13:44:58 -0400
Ian:  From:  
Ian:  To: security-basics@securityfocus.com
Ian:  Subject: verifying an open or closed port on an ip address
Ian:
Ian:  Hello,
Ian:
Ian:  I am looking for a windows compatible utility or method, preferably
Ian:  command line, where I can verify whether a port on an ip address is
Ian:  reachable or not.  I want to be able to do individual ports and not
Ian:  port scans.  Say for instance I wish to verify that port 677 is
Ian:  closed to traffic on ip address Ex. 172.16.0.1, I'm looking for a
Ian:  utility that would do something like:
Ian:
Ian:  Check 172.16.0.1 port 677
Ian:
Ian:  and tell me whether that port was reachable.
Ian:
Ian:  So if I have two networks and I use this command from one I can
Ian:  determine whether a port is reachable on another.  To determine
Ian:  whether a security measure is failing or not.
Ian:
Ian:  There may be a simple way to do this...
Ian:
Ian:  Thanks
Ian:  Ian

I dont understand why you wouldnt portscan.

You could tell nmap (or in your OS, WinNmap) to just probe a single IP's UDP (or TCP) port.

nmap is designed to be flexable. It's what I use when testing for a specific port.

Thanks

 Scott Birl                              
http://concept.temple.edu/sysadmin/
 Senior Systems Administrator            Computer Services   Temple University

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Received on Mon Aug 11 11:54:14 2003