On 2/14/11 9:58 AM, Luc MAIGNAN wrote: > Hi, > > as we have to pay to user Snort Rules, is there a free-of-charge NIDS > available for Linux ? > Snort is the best NIDS, but you can Google for one and see what you come up with. Beside, free is what you get sometimes. You may have to build your own ruleset and that is a major bother. James McKenzie