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Hardware/OS requirement for SNORT/Suricata

Posted on 2013-12-11
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I am planning to install a Passive network monitoring system within a firewall protected network of 10 (may grow to 20 computers eventually) with 100 mbits/sec.  What hardware do I need for SNORT or Suricata and what OS is the best suitable for them?

Is this a good choice or totally overkill?
Dell PowerEdge R620, Intel Xeon E5-2440 2.40GHz, 16GB, 2x 1TB SATA, RAID 1, Dual Port 1GBE Networking card
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Question by:tommym121
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by:Rich Rumble
Rich Rumble earned 250 total points
ID: 39713119
The NIC and CPU are the most important parts. Suricata is able to take advantage of multiple CPU's and Threads, while Snort is single threaded. But you can run more than one instance of snort to use more than one thread if need be.

You should have on NIC that is IP'd, and one that does the sniffing on the span/mirror port(s). If you need more than the two that's fine, just add in another Gb nic. The faster the NIC is capable the better.

The OS does make a difference as well, Linux is able to give you access the packets in a variety of ways, PF_Ring is probably the best way to use Suricata.
http://pevma.blogspot.com/2013/12/suricata-and-grand-slam-of-open-source_4.html
-rich
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btan earned 250 total points
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A nice article on capacity planning for the ids snort.
http://mikelococo.com/2011/08/snort-capacity-planning/

Windows not really preferred. E.g. shared-object rules do not function on windows as of Snort 2.9.0.5. Also for capture traffic capability, if any individual link exceeds about 200Mbits/sec, you need employ a capture framework that features load-balancing and select a compatible interface. It can be inbuilt OS or external LBs.

Understand it may be possible to run multiple snort in multple CPU single hw but it tends to be too complex to delve further,  so Suricata fit in then. Nonetheless even Suricata has scaled up to support to 10Gbps...

https://home.regit.org/2012/07/suricata-to-10gbps-and-beyond/
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by:tommym121
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thanks
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