how do I block unauthenticated users from getting an IP address??

[Guest]

I want to block unauthenticated users on my network from receiving an IP
address from my DHCP/ISA server?? How can I achieve this?? I have WIN2K
server. ISA server 2K.

 

[Pegasus \(MVP\)]

I want to block unauthenticated users on my network from receiving an IP
address from my DHCP/ISA server?? How can I achieve this?? I have WIN2K
server. ISA server 2K.

The sequence of logging on goes like this:
1 A machine is turned on.
2 It obtains an IP address from a DHCP server.
3 The user logs on.

Since 2 comes before 3, the DHCP server cannot
possibly deny an address to an unauthorised user -
because there isn't one at this stage!. Perhaps there
are DHCP servers that can be programmed to issue
an IP address to certain MAC addresses only.
However, it would be quite a job to maintain the
MAC address list up-to-dateat all times!