Why the DHCP reservation works intermittently?

2 MS Windows Server 2003 with SP2 are configured as DHCP servers, with first one take care of the upper range, and second one takes the lower range. There are quite a number of reservations (based on MAC  address) made. But, to dismay, few workstations with dhcp reservation do not seem to grab the fixed IP. Why?

Thanks.
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MichaelBalackAsked:
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Brian PiercePhotographerCommented:
Are the reservations set on BOTH DHCP Servers ?
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Brian PiercePhotographerCommented:
... You need to set the range on both DHCP servers, exclude the high IPs on one and the low IPs on another and set the reservations on BOTH.
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Andrew DavisManagerCommented:
just to add to above, correct the reservations have to exist in both. You may find it helpful to run this script.
http://blogs.technet.com/b/teamdhcp/archive/2006/09/19/dhcp-reservation-tool.aspx

You could have it as an automated task to keep the reservations populated.

Cheers
Andrew
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MichaelBalackAuthor Commented:
Hi KCTS,

We can only do the manual way. I got DHCP1 and DHCP2, to serve the total range of IPs - 192.168.1.51 - 100; DHCP1 is to serve bottom IPs and DHCP2 for Up IPs. Does this means I have to configure DHCP1 to serve 51 -100, and then exclude 76 - 100, and type in the all the reservation? and for DHCP2, to serve 51 -100, and then exclude 51 - 75, and type in all the reservations?
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Andrew DavisManagerCommented:
to do it manually:

you don't HAVE to create the exclusions, but it is good practice.
You can set DHCP1 to pass x.x.x.51 - x.x.x.74
and DHCP2 to pass x.x.x.75 - x.x.x.100
with Both DHCP's having the reservations.

if you don't have the exclusions then the danger is that accidentally someone may change the scope.

Cheers
Andrew
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vivigattCommented:
Reservations can be outside the scope. But they have to be on BOTH servers if you want them to work all the time.
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Brian PiercePhotographerCommented:
I agree with what Andrew said !
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MichaelBalackAuthor Commented:
It works
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Windows Server 2003

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