Re: DHCP Reservation issues

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Thanks for all the help. Problems solved

"Lanwench [MVP - Exchange]" wrote:

Jason <Jason@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
I have solved the initial problem with the reservations (partly). The
probelm was the reserved address was not within the scope.

Yeah, that'll do it. Your scope should be xxx.xxx.xxx.1 - xxx.xxx.xxx.254,
with exclusions - I generally exclude .1 - .100, and .200 - .254.

Addresses that are in the scope but in an excluded range can still be used
for DHCP.

I tend to use .1 for my router/gateway, and servers between .2 - .50 -
(those get statics), and printers between .50 - .100 (those get
reservations).

However, new problem I have is that the SBS server where the DHCP
server resides will not obtain its IP address automatically.

Youch - nor should it. You should *never* use DHCP for a server or a network
device on your internal network. Assign static addresses to those.

Like
the two test machines I have obtaining the reserved addresses, I have
set up a reserved address for my server, 192.168.1.100 but it will
not pick that address up. Note: If I remove the address from the
reserved list when I renew the IP address on the server it works but
obviously picks up one out of the pool. So in short it seems to be
the reserved list address that is creating a problem. I have double
checked the MAC address.



"Jason" wrote:

I have checked this and the MAC address is spot on both in
reservation and lease. I encountered another problem today when
connected to our server via remote desktop. As soon as I logged in,
the login script assigned to my username forced the server to obtain
a DHCP address bringing the network down (I was not popular.)

I need a few machines to ignore the user logon script and always
keep the static IP address.

Thanks for your patience on this one.

"Lanwench [MVP - Exchange]" wrote:

Jason <Jason@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi

I have set up a log in script

This should be in a startup script - users do not by default have
permission to make changes to their network config. If your users
have admin rights, this can be a major problem.

to force clients into using the DHCP
server and override any static settings. The problem I'm having
now is that a couple of machines need static IP addresses and even
though I set a reservation for them in the DHCP console they are
still obtaining an assigned IP from the DHCP server.

A reservation *is* an assigned IP from the DHCP server, but one
that never changes (nor will it be assigned to another network
device via DHCP/BOOTP)

Any ideas as to where I am going wrong?

Make sure the reservations specify their correct MAC addresses. You
can get the MAC address using an ipconfig /all on the client - make
sure it's correct.




.

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