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

[David Bettermann <security_01 () nerv de>]

Hi Ian,

> 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

how about a quite simple "telnet 172.16.0.1 677" issued from the
command line?

> and tell me whether that port was reachable.

Command times out / reports an error: port closed

Telnet connects: well, there's something listening on that particular
port... and may even be greeting you with an identifying banner.

[...]

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

maybe someone's got an even simpler solution?

cu :)

David B.

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