Snort mailing list archives
Re: A question about taps
From: Ted Kaczmarek <tedkaz () optonline net>
Date: Fri, 16 Sep 2005 10:15:17 -0400
On Fri, 2005-09-16 at 14:45 +0100, Brett, Gary wrote:
Hi there Just a quick question, I have in my possession a simple little plastic tap (basically a little adapter type thing that has 3 RJ48 ports on it, it is not a powered device just a little internally wired adapter). After testing it, it does exactly what a tap should do and outputs all traffic it receives on any of the 3 ports to all the other ports. My question is this, from reading snort mailing list archives and FAQ's, people are suggesting that one should invest in a more complex, powered unit e.g. Shomiti, Finisar and Netoptics etc costing many hundreds of dollars in some cases. I would just like to know why my little plastic $5 gizmo is not on that list of recommended items ? Is there something my gizmo does or does not do that makes it a bad choice for a SNORT NIDS (even in my small test environment). I would really like to know Any help on this would be greatly appreciated Gary
The cheaper stuff will be dropping Ethernet frames. As far as using it for test, you can use tcpdump on the nodes to correlate what is sent versus received if you suspect frames are being dropped. The taps you mentioned are are all "Commercial Grade", not critical for a testing setup, but definitely for a production setup. You will also see huge performance differences depending on the nic card the snort box is using, but this is mostly an issue with gigabit today, most of the server class 100 mbit cards should not have any issues with good drivers. Regards, Ted ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ 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
Current thread:
- A question about taps Brett, Gary (Sep 16)
- Re: A question about taps Ted Kaczmarek (Sep 16)
- Re: A question about taps Joel Esler (Sep 16)
- Re: A question about taps Eric Hines (Sep 16)
- Re: A question about taps Eric Hines (Sep 16)
- <Possible follow-ups>
- Re: A question about taps Richard Bejtlich (Sep 16)
- RE: A question about taps Brett, Gary (Sep 16)
- RE: A question about taps Eric Hines (Sep 16)