Snort mailing list archives
RE: (no subject)
From: "Kaplan, Andrew H." <AHKAPLAN () PARTNERS ORG>
Date: Wed, 5 Nov 2003 08:29:37 -0500
J. Thanks for your reply. As to the policy-based.rules file, mine is based on the template found in the Snort 2.0 Intrusion Detection book. The approach it uses has the alert lines at the beginning part of the file, with the pass rules following. According to the book, it is appropriate to have the alerts first, with the pass rules second. However, I will try your approach, and place the pass rules before the alerts and see where that gets me. The server in question is "outside" the firewall such that traffic going to its port, 80, goes through a "hole" in the wall. There are switches interposed between the server and the router. I can contact our network security team to get more information. In response to your inquiry, I am using the book that I mentioned earlier. However, I am also planning on purchasing an additional book. My experience with this one has been mixed. I have tried to use it as much as possible, but I have already contacted the publisher about one mistake that I discovered. If the rules file approach you suggested does work, I shall be contacting the publisher again. I am hoping to get ano- ther book and be able to RTFM. Thanks again for you suggestions, and I will keep you up to date. -----Original Message----- From: J. [mailto:jeruvy () shaw ca] Sent: Tuesday, November 04, 2003 9:24 AM To: Kaplan, Andrew H. Subject: RE: [Snort-users] (no subject) Are you sure your rule order is the way you want it? Most pass rules by default are looked at last, hence you would be seeing this behaviour. As for not seeing alerts from the internet, I'd say good great, but I realize you may want to look at this traffic....so what hardware are you using for your WAN access? (I also hate to say this, but have you actually read the documentation? These issues have been discussed and hashed so many times over the years I am so bored with discussing them. As well there are some great books on the subject...) Note hubs work, switches don't for a rule of thumb. There are other solutions but RTFM. J.
-----Original Message----- From: snort-users-admin () lists sourceforge net [mailto:snort-users-admin () lists sourceforge net]On Behalf Of Kaplan, Andrew H. Sent: Tuesday, November 04, 2003 6:10 AM To: 'snort-users () lists sourceforge net' Subject: [Snort-users] (no subject) When writing the policy-based.rules file I had as my first lines several lines that read as follows: alert ip any any -> [any,10.10.0.0/24] any alert tcp any any -> [any,10.10.0.0/24] any alert udp any any -> [any,10.10.0.0/24] any While these lines were uncommented, I would get an enormous amount of alerts from the 10.10.0.0 subnet even though subsequent pass rules told snort to let pass any and all ip, tcp, and udp traffic on any port. Once I commented out the lines, the alerts dropped down to 0. Do I need any alert rules at the beginning of the policy-based.rules file to specify what subnets, in this case any subnet excluding the 10.10.0.0 subnet, snort should alert me on? If so, what is the correct syntax? I did include the -o option in the command syntax. FYI syntax as follows: /usr/local/bin/snort -i eth0 -c /etc/snort/snort.conf -o The location of the policy-based.rules file is /etc/snort Also, I do not seem to be getting any alerts from traffic coming in from the Internet. Is that normal? ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ 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
------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ 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
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