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.
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