Terry, > Stefano, > > >> An overwhelming majority of network based IDSs use only spatial > >> information present in packet headers. > > > > "spatial" information ? if you mean "IP addresses", then > > I took "spatial" information to mean connection or packet header data > -- more than just IP addresses, but lacking the unstructured data > portions. > > > 1) your statement is definitely not true and > > Actually, I think it is: the majority of unique NIDSs that I am > familiar with were built to use the KDD Cup '99 dataset. I pray none > of those systems are actually used in production anywhere. Let's face > it, only a handful of signature based network intrusion detectors were > ever built. After Marty released Snort to the community, there really > hasn't been a need to build another. Sure, a couple have been so that > they wouldn't be "encumbered" by the open source license, but there > really haven't been any major changes to signature based detection in > the past decade (just thousands of tweaks). Most anomaly or machine
If you extend your familiarity with the NIDS/NIPS industry further, I think you will ultimately find that Stefano is correct. I think that you will find that the majority of the top NIDS/NIPS products use "signature" engines that are not based upon SNORT technology. I think you will also ultimately find that while SNORT is very good at what it was designed to do, it is not a universal solution. Trade-offs were made. The product has strengths and weaknesses. SNORT is not the sine qua non of NIDS. Mercifully, Marty has left some of the market for the rest of us :) > learning based detectors will only work with structured data, so they > limit themselves to the header portions of the packets or connection > records. > > > 2) such IDSs "work" only because of the artifacts in the evaluation datasets > > We can't really say that conclusively. At this point we can only say > that any successes demonstrated by those systems has been due to flaws > in the evaluation datasets. For lack of good evaluation datasets, we > have no idea how those systems might perform in real world > environments. More importantly, for any system which requires training > data we must question how portable it is across different networks; > should it require unique training data for a given network, is it > feasible that such training data will ever be available? > > I see a lot of people saying (correctly) that advanced (non-signature > based) NIDS can't be researched until we have good evaluation > datasets, and I see a lot of people ignoring them and doing it anyway. > Is anyone (else) actually working on fixing the data problem? > > Cheers, > Terry > > Paul
