DHCP Scope issues

Microsoft Windows server 2003
January 21, 2010 at 02:34:45
Specs: Windows server 2003
Hi I am having the scenario in which I am having two DC’s and in that two DC’s there are four DHCP scopes are configured.
Server A

Scope1 –( 192.168.0.20 – 192.168.0.70)

Scope2 –(192.168.0.139- 192.168.0.190)

Server B

Scope3-(192.168.0.71- 192.168.0.126)

Scope4-(192.168.0.191- 192.168.0.254)

Now my question /issue is whenever there is any change in the IP address that whole load is taken care by only 3 scopes from (20-70; 71-126; 139-190) and all these are scopes are getting full but the last scope (191-254) is only having few IP and seems to be is not taken the load from others, is there is any way that the last scope is also take half of the load from other scopes??

The lease duration for DHCP clients is set to 4 days only.


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#1
January 21, 2010 at 08:22:29
My advise would be to delete the scopes and configure only one scope per server, with exceptions instead of dividing it to two scopes. In other words:

Server A - Scope 1:
192.168.0.20 - 192.168.0.190. Exceptions: 192.168.0.71 - 192.168.0.138.

Server B - Scope 1:
192.168.0.71- 192.168.0.254. Exceptions: 192.168.0.126 - 192.168.0.190.

That way you need not think about the 4th scope.


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#2
January 22, 2010 at 07:49:21
What problem are you trying to solve by having four scopes?

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#3
January 22, 2010 at 11:47:12
There is no "load" to scopes. The load is the DHCP services on a DHCP server.

The servers will hand out IP addresses as needed from whatever scopes they have. As long as your PCs are not being left without IP addresses, I'm not sure what you are trying to solve.

Keep in mind that when PCs are left online or come online before the 4 days are up, they will renew their existing IP addresses and not get new ones.


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#4
January 23, 2010 at 16:52:29
I'm also not sure why you want 4 DHCP servers. You could certainly just use one server. If you want to configure your environment for fault tolerant DHCP servers, which is certainly a valid reason for using two servers, the way to do it would be as follows.

It looks like you want to supply IP addresses using a range of 192.168.0.20 - 192.168.0.254., with exception for 192.168.0.1 - 192.168.0.19 and 192.168.127 - 192.168.0.138.

On server A you create a scope from 192.168.0.20 - 192.168.0.254. Create an exclusion range on server A from 192.168.0.126 - 192.168.0.254. Add your exclusion for 192.168.127 - 192.168.0.138. This way, server A will hand out addresses from 192.168.0.20 - 192.168.0.125

On server B, create a scope from 192.168.0.20 - 192.168.0.254. Create an exclusion range on server B from 192.168.0.20 - 192.168.0.125. Add the same exclusion as server A for your reservation 192.168.127 - 192.168.0.138. Server B will hand out addresses from 192.168.0.126 - 192.168.0.254, excluding the exception ranges.


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