cannot change ip address in pool

[Jan nowak]

Hello,
I've got weird problem with isc-dhcp-server (4.1.1-P1-15+squeeze6).
I work in Cable TV and i am responsible of maintaining docsis layer.

##########################################################################################
host m69 { hardware ethernet 00:0a:73:f9:e6:3a; fixed-address 172.16.10.69;
filename "file.cm <http://plik.cm>";}
class "M069" { match if binary-to-ascii(16, 8, ":", option agent.remote-id)
= "0:a:73:f9:e6:3a"; spawn with option agent.remote-id; lease limit 1;}
pool { allow members of "M069"; range 172.16.20.69; }
############################################################################################

In this code i defined IP addresses of modem and CPE. First line
corresponds to modem access layer ( MAC + IP) and second and third lines of
code corresponds to CPE access layer. Problem occurs when i need to change
CPE IP address.
When I changed ip address of CPE and restarted both: isc dhcp server and
CPE, then CPE doesn't get new ip address. It's like isc dhcp server
remembers last ip address and doesn't allow to change it. Few months ago i
used debian lenny and then everthing was good. Now i moved to Debian
squeeze and something goes wrong.

Please help.
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