ignorehost in snort.conf Dose Not ignore my scanner, why?

[Snortty <cwcwcwg () yahoo com>]

Hi, All;

We have a few dedicated port scanners on the big
network running on regular basis, and I want to set up
my snort to ignore those alerts from scanners, so I
put scanner IPs in the snort.conf as:
;
preprocessor portscan-ignorehosts: 10.10.10.1
10.10.10.2
;
;
;
preprocessor portscan2-ignorehosts: 10.10.10.1/32
10.10.10.2/32
;
But still I see a lot of scanning traffics from both
scanners whenever they run, especially alert: spp_bo:
Back Orifice Traffic detected (key: 31337) {udp}

It there anything else I should do in order to filter
out anything coming from the scanners, please anyone?

Thanks a lot!
SW. 


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