How can write rule with a range IP?

[bahamin takhtaei <b_takhtaei () yahoo com>]

Hi,
Please tell me How can write a rule in snort with a range IP, e.g.
alert  icmp   [10.0.0.21 : 151.43.23.76 , 12.5.6.7] any -> any (sid:2000000;)

I checked this rule and found that snort only checks the first boundary of  range (10.0.0.21) in  packets!

Thanks


       
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