We are having a very strange problem , that is we have a lan with 16 vlans and all the vlans have different DHCP for each vlan in the coreswitch (Cisco 6509) and all the clients in the 16 vlans are windows 7 clients , now the problem is that some machines are not getting IP Addresses , but if we see the registry settings in those machines we see that there is an ip address given by the dhcp server in the following key of registery
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\THE RELATED NETWORK CARD KEY
this ip is not being shown in the network settings instead APIPA ip 169.245.*.* is shown here ,
DHCP server configuration are check and verified and they are also ok , packets are also captured which show the whole process of DCHP request is ok and dhcps in the core switch is replying back with the ip address to the machines mac address and that same ip can be seen in the above given registry value.
Kindly help as soon as possible as already alot of time is wasted in tracing this issue.