Snort mailing list archives
RE: Passive Tap Help
From: Lists <echo () beltrani com>
Date: Mon, 01 Dec 2003 11:58:55 -0500
On Mon, 2003-12-01 at 10:50, Frank Knobbe wrote:
On Mon, 2003-12-01 at 09:21, Peters, Michael D. wrote:http://www.snort.org/docs/100Mb_tapping1.pdf is the picture I am referencing. I am looking to decipher the exact pin out of the 100Mb copper tap. It looks like I would have 4 - RJ45 Ethernet jacks in the tap.
...
Both streams are fed from the cable into the hub (on it's RECEIVE lines). Keep in mind that if you monitor a full-duplex connection you will encounter packet loss due to collisions. You either need to force half-duplex on your monitored connection, or use some switch that can guarantee buffering and reassembly of the packets.
... It may be worth replacing the "switch/spanned port" section with a second "sniffing interface" to the sensor. i.e. One interface sniffs incomming, the other sniffs outgoing. I haven't tried this but I expect it could resolve the collision issue mentioned above. Also, a second NIC would most likely be cheaper and easier to find than a switch that can be configured as required. Would anyone with more snort experience care to comment on this? i.e. Does this break any of the preprocessors? What impact would it have on performance? - Paul Beltrani ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ 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:
- Passive Tap Help Peters, Michael D. (Dec 01)
- Re: Passive Tap Help Frank Knobbe (Dec 01)
- <Possible follow-ups>
- RE: Passive Tap Help Peters, Michael D. (Dec 01)
- RE: Passive Tap Help Lists (Dec 01)
- RE: Passive Tap Help Frank Knobbe (Dec 01)
- RE: Passive Tap Help Frank Knobbe (Dec 01)
- RE: Passive Tap Help Lists (Dec 01)
- RE: Passive Tap Help Frank Knobbe (Dec 01)
- RE: Passive Tap Help Frank Knobbe (Dec 01)
- RE: Passive Tap Help Dirk Geschke (Dec 01)
- RE: Passive Tap Help Frank Knobbe (Dec 01)
- RE: Passive Tap Help Frank Knobbe (Dec 03)
- Re: Passive Tap Help Jeff Nathan (Dec 01)
- Re: Passive Tap Help Frank Knobbe (Dec 01)
- Re: Passive Tap Help Jeff Nathan (Dec 02)