Hello,
You can cut your ip range in two. one for dhcp and the other for fixed ip.
from chilli manual :
edit your chilli.conf
--net net
Network address of the uplink interface (default = 192.168.182.0/24). The network address is set during initialisation when chilli establishes a tun device for the uplink interface. The network address is specified as either <address>/<netmask> (192.168.182.0/255.255.255.0) or <address>/<prefix> (192.168.182.0/24).--dynip net
Dynamic IP address pool. Specifies a pool of dynamic IP addresses. If this option is omitted the network address specified by the net option is used for dynamic IP address allocation. See the net option for a description of the network address format.--statip net
Static IP address pool. Specifies a pool of static IP addresses. With static address allocation the IP address of the client can be specified by the radius server. Static address allocation can be used for both MAC authentication and Wireless Protected Access.
so you can do as it in your chilli.conf :
net 192.168.182.0/24
dynip 192.168.182.128/25
statip 192.168.182.0/25
et voila !