Multiple reverse lookups on WS 2003 DNS

Hello Everybody . We have moved the DHCP Server from Microsoft to Cisco , Things are working fine other than the DNS reverse lookup's . When a machine gets a new IP address , its registering a new reverse lookup in the DNS , good , but the issue here is that the old record is not deleted . so for

Windows multiple DNS entries

Hi all I have got dhcp setup on a cisco switch . When a new machine is switched on , it get's a dhcp address and registers in the dns , this works fine , but when the lease expires , or if for some reason if the same machine get's a new ip address, the DNS is not recognising this dynamically . It