about multiple nas

Hello all,     Does anyone know how to configure the users on the multiple nas/clients in freeradius? for example : my nas type (client type) is chillispot access points. my first nas ip address is 192.168.1.1 my second nas ip address is 192.168.1.2 my third nas ip address is 192.168.1.3 "bot" user must be valid from these NASs/Clients. So, I inserted below rows in radcheck table. But it is not working. Username       | Attribute     |   op |   value | | dagia             | NAS-IP-Address     | == | 192.168.1.1|192.168.1.2|192.168.1.3 | Anyone help me pls?