Great Circle Associates Firewalls
(August 1997)
 

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Subject: Re: UDP scanner
From: "Paul D. Robertson" <proberts @ clark . net>
Date: Fri, 29 Aug 1997 22:57:28 -0400 (EDT)
To: Lyndon David <lyndond @ sentinet . co . uk>
Cc: firewalls @ GreatCircle . COM
In-reply-to: <3406C623 . D02530A1 @ sentinet . co . uk>

On Fri, 29 Aug 1997, Lyndon David wrote:

> Quick question,
> 
> Does anyone know of a UDP port scanner. I know that this is
> a much harder job than a TCP port scanner. If you fire off
> an arbitary UDP packet at a machine and you get an ICMP message
> back saying nothing listening then you know that that port is
> dead. If you get nothing back then either something is listening
> and swallowed it or the packet got lost or the filtering is
> set not to send ICMP replies.
> 
> Anyone know of any software that does this?

AIR Hobbit's Netcat will also scan UDP on some systems.  It's at 
http://www.avian.org and one of the most useful gadgets written.

Paul
-----------------------------------------------------------------------------
Paul D. Robertson      "My statements in this message are personal opinions
proberts @
 clark .
 net      which may have no basis whatsoever in fact."
                                                                     PSB#9280

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References:
  • UDP scanner
    From: Lyndon David <lyndond @ sentinet . co . uk>
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