DHCP allocate the same ip
I'm working for a small company that sells the internet, and we use ISC as our DHCP server. I have a sort of problem whit it because when a DHCP client automatically attempts to renew its lease as soon as 50 percent of the lease duration has expired, the server allocates the same IP address instead of any different. My question is, is there a parameter on the server configuration that the DHCP client obtain a new IP address. thank you for your time.