misuse detector

[kitkat <ketaki2901 () hotmail com>]

hello,

I am working on a misuse detector using neural networks as a part of my 
last year project. We r using matlab and have some difficulties.

We have formed the net and trained it with 4 attacks and normal type..we r 
giving input from all 5 types together..v have used 3 hidden layers and 
150,1500,150 neurons in each respectively.

I have some problems here....with neural networks the principal advantage 
is updation is easier but here if v use the same way of giving inputs 
together then training the network again with a new attack type will be 
very difficult...so i dont know whether this is the actual method of 
implementing the detector.

Also with the above combination of layers and neurons we r not getting 
satisfactory results---please answer my questions if possible

thank u
ketaki

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