Snort mailing list archives
RE: -o and pass/alert/log usage
From: Joe Fico <Fico () AirAuto COM>
Date: Wed, 27 Jun 2001 16:05:13 -0700
Well I changed my rules to look like this. #pass icmp 172.16.100.9/32 any <- any any (msg:"PASSING ICMP from N.A. NOC Server";) alert icmp 172.16.100.9/32 any <- any any (msg:" ALERTING ICMP FROM N.A. NOC Server";) and I got this message. Jun 27 15:54:52 localhost snort[5629]: ALERTING ICMP FROM N.A. NOC Server: 172.16.100.9 -> 198.182.113.130 so thats cool now I can uncomment out the pass rule and I get... nothing. Why don't I get a message for the pass rule?
-----Original Message----- From: joey () SiliconDefense com [mailto:joey () SiliconDefense com] Sent: Wednesday, June 27, 2001 3:39 PM To: Sheahan, Paul (PCLN-NW); 'Joe Fico' Cc: Snort-users Subject: Re: [Snort-users] -o and pass/alert/log usage Paul: That is correct. Pass rules take precedence when -o is used, regardless of where they are located with respect to alert rules. Joe: Looking at your problem, I'm wondering if your ROUTER ICMP alert rules contain addresses that are outside of your HOME_NET. This would explain why they are not being passed on. First, make them valid addresses by adding the /32 netmask. Next, confirm that they do exist in your HOME_NET. If that doesn't help, try changing $HOME_NET in your pass rules to "any". Next, I would try removing the $HOME_NET variables from the msg field, take out the "->" in the msg field while you are at it. We're just making sure Snort is parsing the rule incorrectly. Post back with your findings. Hope this helps, -Joe M.
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Current thread:
- -o and pass/alert/log usage Joe Fico (Jun 26)
- <Possible follow-ups>
- FW: -o and pass/alert/log usage Joe Fico (Jun 27)
- Re: FW: -o and pass/alert/log usage Phil Wood (Jun 27)
- RE: -o and pass/alert/log usage Sheahan, Paul (PCLN-NW) (Jun 27)
- Re: -o and pass/alert/log usage Joe McAlerney (Jun 27)
- RE: -o and pass/alert/log usage Joe Fico (Jun 27)
- RE: -o and pass/alert/log usage James Hoagland (Jun 28)
- Re: -o and pass/alert/log usage Joe McAlerney (Jun 27)
- Re: -o and pass/alert/log usage Tony Lill (Jun 28)