I am using a Cisco 877, but I have noticed I get a new IP everytime, but the next one up, there are only 2 PC's on this router. I get an IP of 192.168.2.11, then tomorrow it will be 192.168.2.12, then 13, 14 etc, surely it should release the IP after a day or 2 and reuse the IP's at the beggining of the scope?
ip dhcp pool client
network 192.168.2.0 255.255.255.0
dns-server 188.8.131.52 184.108.40.206 220.127.116.11
lease 0 2