Snort mailing list archives
RE: Advice on quad ethernet card
From: Richard Bejtlich <taosecurity () gmail com>
Date: Fri, 19 Nov 2004 16:22:08 -0500
Darden, Patrick S. wrote:
I don't think this is a good idea. You will see a lot of drops if you have any amount of traffic at all.
Hello Patrick D and Patrick M, I disagree with this opinion, but I respect your caution. Still, if "a lot of drops" occurred with "any amount of traffic at all," how could vendors ever sell quad NICs? Your Snort performance is a function of the following components: - CPU - RAM - Hard drive - PCI bus - NIC quality - Sensor OS - Snort Configuration These are not in any particular order. Choosing a high-quality quad NIC -- or any NIC -- is important. (Ask old Realtek owners.) I've had good quad NIC capture results for 10/100 Mbps with the Adaptec ANA-62044. [0] The ANA-62044 isn't sold new, so Adaptec's upgrade product is a 66 MHz 64 bit card. [1] The ANA-62044 is a 33 MHz 64 bit card. I believe Intel makes some of the best NICs around, but their current quad NIC is a gigabit card. [2] For that reason I would avoid it, unless you conduct rigorous testing. When you start thinking you can monitor multiple gigabit links with a quad NIC, you need to be using a robust PCI-X bus and not regular PCI, plus carefully handling all of the other performance factors listed earlier. Patrick D's recommendation of using two dual NICs might also work. I've used Intel PRO/100+ Dual Port Server Adapters (PILA8472), although I had to replace one of them after a hardware failure. Intel's new dual NICs are either 10/100 Mbps crypto-enabled models or gigabit models. [3, 4] Whatever you decide, you should try building a test sensor and see how it performs in your environment. Sincerely, Richard http://www.taosecurity.com [0] http://www.adaptec.com/worldwide/support/suppdetail.jsp?sess=no&language=English+US&prodkey=ANA-62044 [1] http://www.adaptec.com/worldwide/product/proddetail.html?sess=no&language=English+US&prodkey=ANA-64044LV [2] http://www.intel.com/network/connectivity/products/pro1000mt_quad_server_adapter.htm [3] http://www.intel.com/network/connectivity/products/pro100dport_adapter.htm [4] http://www.intel.com/network/connectivity/products/pro1000mt_dual_server_adapter.htm ------------------------------------------------------- This SF.Net email is sponsored by: InterSystems CACHE FREE OODBMS DOWNLOAD - A multidimensional database that combines robust object and relational technologies, making it a perfect match for Java, C++,COM, XML, ODBC and JDBC. www.intersystems.com/match8 _______________________________________________ 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:
- Advice on quad ethernet card Patrick Marquetecken (Nov 19)
- Re: Advice on quad ethernet card Glenn Forbes Fleming Larratt (Nov 29)
- Re: Advice on quad ethernet card sekure (Nov 29)
- <Possible follow-ups>
- RE: Advice on quad ethernet card Darden, Patrick S. (Nov 19)
- RE: Advice on quad ethernet card Richard Bejtlich (Nov 19)
- Re: Advice on quad ethernet card Glenn Forbes Fleming Larratt (Nov 29)