Alert from Internal Net as Attacker

[Giuseppe Morici <giuseppe.morici () e-gate it>]

Hello,
i've a question and hope that someone can give me some answer about.
There is a possibility of exlude alert when the "source" it's a range of ip or aliases?
The ip in source is an Internal net ip (of course is in whitelist and in Default list as home net) , infact the alert 
pop up but don't go in blocked list cause the ip is whitelisted.
There is a possibility to exclude the alert only if source is internal net without disable the rules and let them to 
work for "real" attak? (this is just for limite the spam in alert list)
Thanks for your help.
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Distinti Saluti
Giuseppe Morici
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