We have two T3 links running at 21 mbps each. I had 1 4230 running on each link but due to some asymetric routing issues the sensors weren't able to see the full duplex flows. We now have a Top Layer IDS Balancer bringing both links into the one device. I now have one 4230 monitoring the two links and the sensor is failing to keep up with the traffic. I have one sniffer on both links as well and it sees all packets. A test we ran was to use the /etc/shadow string match. The sensor only saw on average every third or fourth character. The sniffer on the other hand saw them all. We then disabled one T3 and the sensor did see the entire string. This really opens my eyes to what other attacks may be going on that I am blind to. Thoughts or has anyone else sen these performance problems?
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