Best Place to Filter False Positive?

[9tgonzalez]

I have a couple of IDS sensors feeding events into CS-MARS. I have two options; I could filter them in the IDS sensors, or in CS-MARS.

Where is the best place to filter them?

[ibanezm]

False positives should be filtered at the sensor. If the sig being falsely triggered does not apply to any protected system, then the sig can be disabled or even retired. Otherwise, just filter the src or dst ip or network as applicable.

[ddidier]

hello,

I believe you are going to need to filter on both devices. I suggest tunning the sensors lightly - only tune out the obvious issues that you never expect to be a problem. Then I would see how things go with your network and the MARS and do any additional tunning on the MARS. Tunning on the MARS is very easy to do and the tunning can be quite specific (specific hosts, protocols, devices.. etc).

Hope that helps,

Dan