Snort mailing list archives
Re[2]: Cisco Catalyst - SNORT
From: Lukasz Bromirski <lbromirski () mr0vka eu org>
Date: Fri, 27 Jun 2003 22:23:36 +0200
Hello, RA> Most current switches have either 8 or 16 port chip sets. That's quite correct. RA> Someone is likely to say that Cisco's mirroring (as an example only) RA> functions at wire speeds even on gig ports, when in fact their RA> experience involved other unknown conditions (such as port 1 to port 4 RA> on the same chip set) for which they have little/no real knowledge. Well, the Catalyst 2950 and 3550 boxes for example do SPAN with wire-speed, regardless of which port is actually source port, and which one is destination port. However, Cisco states clearly, that highly oversubscribed destination port can slow down source ports - which is logical because it come down to buffers capacity. With Snort installations the highly oversubscribed situation can surface quite easily (one port sniffing traffic other 23 or 47 ones for example). RA> There are many switches on the market today that will do wire speed RA> mirroring on adjacent gig ports, but may drop packets between ports on RA> different chip sets or differnet blades. Indeed. It's just a question of detailed documentation available (including some architectural details), which most of the off-the-shelf switches lack. Just my 0,05PLN -- Ćukasz Bromirski lbromirski[at]mr0vka.eu.org PGP key http://mr0vka.eu.org/pgp.asc http://mr0vka.eu.org PGP finger 5C3B 723F A1FA A2BA E57A E959 62A8 63C2 093B 6C49 ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 _______________________________________________ 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:
- Re: Cisco Catalyst - SNORT, (continued)
- Re: Cisco Catalyst - SNORT Javier Liendo (Jun 23)
- Re: Cisco Catalyst - SNORT Scott Fringer (Jun 23)
- RE: Cisco Catalyst - SNORT Falvo, Jose Luis - (Arg) (Jun 23)
- RE: Cisco Catalyst - SNORT Tinsley Paul (Jun 23)
- RE: Cisco Catalyst - SNORT twig les (Jun 23)
- RE: Cisco Catalyst - SNORT shannong (Jun 24)
- RE: Cisco Catalyst - SNORT Jeff Nathan (Jun 26)
- snort + 802.11 management frames ... Jon Baer (Jun 26)
- Re: Cisco Catalyst - SNORT Gary Flynn (Jun 27)
- Re: Cisco Catalyst - SNORT Rich Adamson (Jun 27)
- Re[2]: Cisco Catalyst - SNORT Lukasz Bromirski (Jun 27)
- Re: Cisco Catalyst - SNORT Jeff Nathan (Jun 27)
- Foundry performance? (was "Re: Cisco Catalyst - SNORT") twig les (Jun 27)
- Re: Foundry performance? (was "Re: Cisco Catalyst - SNORT") Roy S. Rapoport (Jun 28)
- OT: Re: Foundry performance? Chris Green (Jun 30)
- RE: Cisco Catalyst - SNORT twig les (Jun 23)
- Re: Cisco Catalyst - SNORT Javier Liendo (Jun 23)
- Re: Cisco Catalyst - SNORT Gary Flynn (Jun 27)
- Re: Cisco Catalyst - SNORT Jeff Nathan (Jun 27)
- RE: Cisco Catalyst - SNORT Mike Feetham (Jun 27)