hi all i have a question i wonder if anyone can help me

when a client machine has received the DHCP Acknowledgement from a dhcp server and initializes the ip address it is offered, where is this data stored? there must be a cache either in memory or on disk or something. please can anyone tell me where it is stored? im curious about this

many thanks

Windows XP stores information about IP & DHCP in registry in

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\{B8088F46-3AD1-4CE3-A0AD-6BC9C1E6DB54}\Parameters\Tcpip]

The CLSID can be diffrent from me perhaps ...

thank you

so if i i restart the machine the registry is checked and if there is an IP in there that was previously leased the machine will re-request that IP

unless it has expired of course

thanks sonic

%systemroot%\system32\dhcp\dhcp.mdb on the server hosting the DHCP service.

During a normal shutdown the IP address is released by the client. During startup most DHCP servers will grant the same IP adress if it is still available.

During a normal shutdown the IP address is released by the client. During startup most DHCP servers will grant the same IP adress if it is still available.

oh so its more of a server side thing?

i guess the DHCP server checks the MAC address of the computer requesting a lease, see's that its previously had 192.168.1.5 for example and then re offers it to the client machine

would i be right in saying this?

The document that describes the DHCP protocol is RFC2131 you can read the document at http://www.ietf.org/rfc/rfc2131.txt. Are you trying to determine the current IP, previous IP, or trying to get a specific IP from the server?

i didnt ask this question for any reason at all, i just wanted to further my understanding

so thank you everyone that has offered help

and thanks for the link to the rfc, cant believe i didnt think to just read that in the first place lol

thanks