Snort mailing list archives
Re: simultaneous snort and tcpdump
From: Bennett Todd <bet () rahul net>
Date: Thu, 26 Sep 2002 17:11:54 -0400
2002-09-26-16:47:40 Carl Gibbons:
Okay, here's an example of what I'd like: for every snort alert, don't just save (into mmdd () hhmm-snort log) the packet that caused the alert, but also save the ten preceeding and ten succeeding packets between the same hosts.
Sounds spiffy. Sounds like something that would require a fair amount of additional code; I'm not sure how would be easiest to craft that code.
This is why I am running tcpdump and snort simultaneously.
If you've got the resources to take that approach, it's probably the simplest approximation to implement.
My question remains. Sorry, Jason, but your "RTFM" suggestion to craft a clever snort rule doesn't help.
Perhaps I misunderstood Jason, but I _think_ his suggestion is very relevant. I took him to mean that it might be more efficient to use one snort to do the job you're currently doing with snort + tcpdump. Rather than running both snort and tcpdump, run just snort, and configure the snort to log everything, by creating a rule that logs everything. I think the canonical example might be log any any any <> any any although I'm not sure, as I haven't actually tried this. If you don't need the alerts in real-time, another approach might be to just use either snort or tcpdump as a pure packet capture to save everything in a libpcap format file, then as you rotate logs, rotate them clean off your capture sniffer to a log archival system, and there run snort over them with -r. -Bennett
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Current thread:
- simultaneous snort and tcpdump Carl Gibbons (Sep 20)
- Re: simultaneous snort and tcpdump Bennett Todd (Sep 20)
- Re: simultaneous snort and tcpdump Gary Flynn (Sep 20)
- Re: simultaneous snort and tcpdump Carl Gibbons (Sep 21)
- Re: simultaneous snort and tcpdump Jason (Sep 22)
- Re: simultaneous snort and tcpdump Carl Gibbons (Sep 26)
- Re: simultaneous snort and tcpdump Bennett Todd (Sep 26)
- Re: simultaneous snort and tcpdump Carl Gibbons (Sep 26)
- Re: simultaneous snort and tcpdump Jason (Sep 26)
- Re: simultaneous snort and tcpdump Gary Flynn (Sep 20)
- Re: simultaneous snort and tcpdump Gary Flynn (Sep 26)
- Re: simultaneous snort and tcpdump Martin Roesch (Sep 26)
- Re: simultaneous snort and tcpdump Bennett Todd (Sep 20)