Todd,
Thanks for the reply. It was indeed a firewall issue - the device I was
scanning was sending ICMP Host Administratively Unreachable packets when I
tried certain scans, so I was seeing those packets. As per the detail below I
wasn't seeing the original traffic because of a problem with the _NET
definitions.
Thanks,
David
-----Original Message-----
From: Todd Wease [mailto:twease@sourcefire.com]
Sent: 30 May 2007 13:15
To: David Ryan
Cc: snort-users@lists.sourceforge.net
Subject: Re: [Snort-users] Everything being triggered as 1:486:4 ICMP
unreachable
David Ryan wrote:
All,
To partly reply to my own question - one of my flaws was keeping
$HOME_NET as 10.0.0.0/8 - this prevented most of my test traffic from
triggering since my tests were coming from $HOME_NET and not
$EXTERNAL_NET. This was significant where the rule I was testing was
of the form $EXTERNAL_NET -> $HOME_NET
[SNIP]
David
Sounds like it might be a firewall issue. This response is usually sent
by a firewall to say that it's filter won't allow communication with
that host/port. It may be allowing ssh to that host (port 22) and may
be allowing pings, but not allowing the host/port combo used in your test.
Todd
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