Snort mailing list archives
Strange snort behaviour, failure to log all traffic.
From: hulver <hulver () gmail com>
Date: Fri, 17 Jun 2005 12:21:01 +0100
I'm having some very strange problems with snort not capturing all packets. I've been running snort for ages, and I've recently upgraded it to try and fix this problem, I'm now running snort 2.3.3 (build 14). I compiled it from source. My libpcap is 0.7. I'm running it on Debian machine running a 2.4.18 kernel. My problem is, snort only logs traffic where the sensors IP address is involved. My sensor is 192.168.1.3, and the only stuff in my logs is to or from IP 192.168.1.3. It used to log all traffic going past the sensor (which is installed next to the router). Now, here's the strange part. If I run "snort -v" from the command line, I can see all traffic to all IP's on my network. What's even stranger, is that if I run "snort -v" suddenly the daemon version will also start logging that traffic as well. I set up a rule to test this. ruletype logall { type log output log_tcpdump: complaint.log } logall tcp 62.172.x.x any <> any any logall udp 62.172.x.x any <> any any logall icmp 62.172.x.x any <> any any I restarted snort, and started pinging the 62.172.x.x address from another machine on the network. Nothing was logged. I then ran "snort -v > /dev/null &" and did then ping again. Now packets started getting logged to the log file. I stopped the "snort -v" instance and ran the ping again. Nothing was logged. I've checked, and the interface is in PROMISC mode no matter how many instances of snort I'm running, but I only get to log all traffic if I run a "snort -v" in the background. Can anybody help? -- http://www.hulver.com/scoop/ ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_idt77&alloc_id492&op=click _______________________________________________ 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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- Strange snort behaviour, failure to log all traffic. hulver (Jun 17)