Question : Cisco Router DHCP Lease times - force client renewal

I have a Cisco 1700 series router with DHCP enabled wih infinite lease time.  DHCP is handing out DNS addresses however I had to change the IP address for DNS servers.  Being that the lease time was infinite, is there any way I could get the router to force the workstations to renew their DHCP addresses to reflect the new DNS servers?

 Cisco 1700 series router
IOS ver. 12.0

Thanks
TomW

Answer : Cisco Router DHCP Lease times - force client renewal

Another option would be to issue the "ipconfig /flushdns" and "ipconfig /registerdns" command from a command window in Windows XP.  This forces Windows XP to renew leases as well.

or

Option 2:

On the router change the lease time to 0 with the following commands

ip dhcp pool
  lease 0

then change the lease back after the workstations have rebooted.

ip dhcp pool
  lease infinite

Let me know your thoughts
MP