rlm_ippool error problem

[Asaad]

Dear All :

rlm_ippool return duplicate ip address


in past i used version Version 1.0.5 , so i thought  that may be bug in the version

so i installed  Version 2.0.1 and the problem is still appears

but in the last version the problem appears always in specific  ips for example

x.x.117.63 , x.x .119.162

after lot of debug i doubte in the pool defintions starting not from 1 and the mask!!!!
        
  ippool nonsub_pool {
                        range-start = x.x.116.177
                        range-stop = x.x.119.254

                        netmask = 255.255.252.0

                        cache-size = 833

                        session-db = ${raddbdir}/dbnon.ippool

                        ip-index = ${raddbdir}/dbnon.ipindex

                        override = no
                }



any idea or hint please 

Thanks



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