checking authorization in the duration of connection

[Eric]

Hi,
My radius server use ldap server for authorize and authentication.I set an
attribute in ldap server that is the check-name in sqlcounter to limit users
Input traffic. I want when user traffic reaches to this amount the user
become stop but radius checks ldap attributes only at the first of
connection not in the middle. How can I set radius server check users
traffic with the amount of this attribute in ldap server in the duration of
connection?
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