25. How can I control which clients get leases from my server?
There is no ideal answer: you have to give something up or do some extra work.
· You can put all your clients on a subnet of your own along with your own
DHCP server.
· You can use manual allocation.
· Perhaps you can find DHCP server software that allows you to list which
MAC addresses the server will accept. DHCP servers that support roaming
machines may be adapted to such use.
· You can use the user class option assuming your clients and server
support it: it will require you to configure each of your clients with a user
class name. You still depend upon the other clients to respect your
wishes.
26. How can I prevent unauthorized laptops from using a network that uses DHCP for dynamic addressing?
This would have to be done using a mechanism other than DHCP. DHCP does not
prevent other clients from using the addresses it is set to hand out nor can it
distinguish between a computer's permanent MAC address and one set by the
computer's user. DHCP can impose no restrictions on what IP address can use a
particular port nor control the IP address used by any client.
is down, one of those clients can lease an address from the other server.
However, without communication between the two servers to share their
information on current leases, when one server is down, any client with a lease
from it will not be able to renew their lease with the other server. Such
communication is the purpose of the "server to server protocol" (see next
question). It is possible that some server vendors have addressed this issue with
their own proprietary server-to-server communication.
20. When will the server to server protocol be defined?
The DHC WG of the IETF is actively investigating the issues in inter-server
communication. The protocol should be defined "soon".
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