Snort mailing list archives
some packets not seen?
From: Siim Põder <siim () p6drad-teel net>
Date: Mon, 15 Sep 2008 18:47:09 +0300
Hi. I have a problem that some/all/most packets are not seen by my rules. In order to show the problem, I made the conf as simple as possible (2.8.3) # dirs dynamicengine /usr/lib/snort_dynamicengine/libsf_engine.so # output output alert_syslog: LOG_AUTH LOG_ALERT include ruleset.conf and only this rule: alert tcp SRCIP any -> DSTIP DSTPORT (msg:"packet detected"; sid:33001; gid:1; rev:1; ) When i initiate connection from SRCIP to DSTIP:DSTPORT, only one alert is generated. from this simplistic configuration i would expect one alert per packet (syn, ack, push, fin, ack), but only the first syn seems to be seen (or maybe the first ack): Sep 15 11:45:54 box snort[20223]: [1:33001:1] packet detected {TCP} SRCIP:52626 -> DSTIP:DSTPORT I'm not sure if it should make any difference, but the connections are initiated from the machine running snort in this case (its an 64bit machine, if it makes a difference). My question is, shouldn't I see all the packets (in 1 direction) generating alerts in this case? If not, why? How can I make sure that a rule gets all the data sent? I stumbled on this problem (or misunderstanding from my part) while debugging a dynamic rule that wasn't alerting on data sent from local machine, only for the payload coming from remote machines. Siim ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ 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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- some packets not seen? Siim Põder (Sep 15)