Snort mailing list archives
RE: how to further diagnose 'ICMP Destination Unreachable' problem?
From: "Briggs, Bruce" <Bruce.Briggs () suny edu>
Date: Tue, 30 Aug 2005 09:39:02 -0400
You can find out a little more about ICMP Destination Unreachable here: http://www.networksorcery.com/enp/protocol/icmp/msg3.htm It could be caused by a number of things. For example there could be a firewall (or router with ACLs) which is preventing a packet from being received/forwarded and if the firewall had an option enabled to notify the sender of this blocked port packet, then an ICMP type 3 code 3 packet would be sent out to the initiating IP addr from the firewall. Bruce -----Original Message----- From: snort-users-admin () lists sourceforge net [mailto:snort-users-admin () lists sourceforge net] On Behalf Of Chris W. Parker Sent: Monday, August 29, 2005 1:12 PM To: snort-users () lists sourceforge net Subject: [Snort-users] how to further diagnose 'ICMP Destination Unreachable' problem? Hello, I have a lot of 'ICMP Destination Unreachable Port Unreachable' alerts (36%) and I'm wondering what I should do to diagnose and correct the problem. I don't know much about networking so I wasn't able to glean much insight from the Snort website (http://www.snort.org/pub-bin/sigs.cgi?sid=402). Any suggestions? Thanks, Chris. ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=ort-users ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- how to further diagnose 'ICMP Destination Unreachable' problem? Chris W. Parker (Aug 29)
- Re: how to further diagnose 'ICMP Destination Unreachable' problem? Alex Butcher, ISC/ISYS (Aug 31)
- <Possible follow-ups>
- RE: how to further diagnose 'ICMP Destination Unreachable' problem? Briggs, Bruce (Aug 30)
- RE: how to further diagnose 'ICMP Destination Unreachable' problem? Chris W. Parker (Aug 30)
- Re: how to further diagnose 'ICMP Destination Unreachable' problem? Stephen Nesman (Aug 30)