Great Circle Associates Firewalls
(August 1997)
 

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Subject: UDP scanner
From: Lyndon David <lyndond @ sentinet . co . uk>
Date: Fri, 29 Aug 1997 13:52:51 +0100
To: firewalls @ greatcircle . com

Hi

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?

Thanks

Lyndon

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature


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