IDS mailing list archives
RE: ASIC Based IPS
From: THolman () toplayer com
Date: Wed, 30 Mar 2005 16:59:38 -0500
Hi Sid, Just because an IPS device uses an ASIC or two, does NOT mean it is very fast. The key to speed and low latency is ARCHITECTURE. For example, a device that uses a single ASIC to process all network data will not be much faster than a PC using a single Intel processor. The benefits of speed come about when you start using ASICs in parallel - so, one ASIC to carry out L2 checks, one ASIC to carry out L3 checks and so forth. Furthermore, such a device needs a backplane and network processors that support such a design. A good, parallel-ASIC design thus enables vendors to claim high speed and low latency. Another very important point to consider is whether or not the vendor uses off-the-shelf general network ASICs (which offer good network level L2/L3/L4 performance), or use ASICs that are designed from the ground up to handle the very different nature of L5-L7 packet contents. It is also important to consider whether or not there is a dedicated ASIC on-board to handle each of the separate functions that you would expect from an IPS, instead of cramming multiple functions into two or three ASICs and thus affecting latency and performance. What you should also look for is a device which uses FPGAs - these are in effect programmable ASICs (as off the shelf ASICs are read-only, FPGAs are the writable versions that allow direct coding of the processors). Use of FPGAs enable vendors to keep their devices up-to-date and relevant to the current network security landscape. The ability to write a signature/protocol check into machine code and put it on a processor has a HUGE impact on the performance of the device as opposed to one that uses either standard ASICs or PC-based hardware. Gartner's Seven Key Selection Criteria for Network IPS should also assist you in selecting an IPS. Although performance is important, this details 6 other criteria that are crucial in product selection. Hope this helps ! Cheers, Tim Tim Holman Security Consultant (EMEA) Top Layer Networks Inc -----Original Message----- From: Siddharth Phadnis [mailto:siddharth.phadnis () impetus co in] Sent: 29 March 2005 12:27 To: IDS FOCUS Subject: ASIC Based IPS Hi everyone, Currently a lot of IPS vendors talk about their devices being very fast being based on ASIC. Just out of curiosity, I would be glad if someone could point me towards how all the signatures and analysis/blocking software works from ASIC and how does that affect the latency which is introduced into traffic because I believe the full packet payload will have to be inspected in case of application layer anomalies. Thanks and Regards, Sid. -------------------------------------------------------------------------- Test Your IDS Is your IDS deployed correctly? Find out quickly and easily by testing it with real-world attacks from CORE IMPACT. Go to http://www.securityfocus.com/sponsor/CoreSecurity_focus-ids_040708 to learn more. -------------------------------------------------------------------------- -------------------------------------------------------------------------- Test Your IDS Is your IDS deployed correctly? Find out quickly and easily by testing it with real-world attacks from CORE IMPACT. Go to http://www.securityfocus.com/sponsor/CoreSecurity_focus-ids_040708 to learn more. --------------------------------------------------------------------------
Current thread:
- ASIC Based IPS Siddharth Phadnis (Mar 29)
- <Possible follow-ups>
- RE: ASIC Based IPS THolman (Mar 31)