thresholding by src and dst

[hchlai () netscape net (Hugo)]

Is it possible to do any thresholding (like limit, threshold & suppress) based on unique sets of source and destination 
IPs? If I understand correctly, Snort only allows me to do thresholding based on the following:

allow $X number of alerts per $Y amount of time either based on source and destination IP

or

allow 1 count every $X number of alerts within $Y amount of time based on source or destination IP

Are there any other options out there to do thresholding?
Many thanks!

Hugo


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