Terminating DHCP Lease from Server

[Peter]

I am new to DHCP Server and would like to ask a number of
questions:

1) Is it possible to terminate a DHCP Lease from DHCP
Server ? How ? This is because someone says that
deactivate the scope doesn't mean that the client will
release the IP address AND we have to go to client and
type IPCONFIG / RELEASE.

2)What is the difference between stopping the DHCP Service
and deactivate the scope (IF there is only 1 scope) ?

3)If we have already running a DNS Server and want to set
up a DHCP Server. Is there any easy way to reserve those
IP address for those DNS Entry (Like: Lotus Notes Server,
Payroll Server ...) ? Besides, for those static IP
address (For Servers), we should use Reserve OR Exclusion ?

4) For our network 192.18.18.0 to 192.18.18.255, we should
create 1 scope OR breaks it up to a number of scopes (Like
4) ? Even though we break it up to 4, we can still cannot
control which scope offers the IP address to DHCP Client.

Thanks

 

[Richard G. Harper]

Responses inline:

I am new to DHCP Server and would like to ask a number of
questions:

1) Is it possible to terminate a DHCP Lease from DHCP
Server ? How ? This is because someone says that
deactivate the scope doesn't mean that the client will
release the IP address AND we have to go to client and
type IPCONFIG / RELEASE.

As long as the computer thinks it has a valid lease, it will continue to try
to use the address last assigned by the DHCP server. So yes, if you
de-activate a DHCP address range you must RELEASE and RENEW addresses on all
its former clients to get them to pick up new addresses.

2)What is the difference between stopping the DHCP Service
and deactivate the scope (IF there is only 1 scope) ?

None, in essence.

3)If we have already running a DNS Server and want to set
up a DHCP Server. Is there any easy way to reserve those
IP address for those DNS Entry (Like: Lotus Notes Server,
Payroll Server ...) ? Besides, for those static IP
address (For Servers), we should use Reserve OR Exclusion ?

I would recommend putting reservations in place for computers that must be
on a locked IP address. It doesn't matter if these servers stay on locked
IP addresses, as long as a reservation is in the range the DHCP server won't
try to issue the address to another PC. Besides, by using reservations
instead of exclusions you can put comments in the DHCP database to document
what is on those addresses.

4) For our network 192.18.18.0 to 192.18.18.255, we should
create 1 scope OR breaks it up to a number of scopes (Like
4) ? Even though we break it up to 4, we can still cannot
control which scope offers the IP address to DHCP Client.

Why do you think you need multiple scopes, especially in a 254-address
range? Keep it simple and use only one scope unless there is a reason not
to.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
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