DHCP 80/20 Rule

AGenMIS
AGenMIS used Ask the Experts™
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We have two sites, each site has a Domain Controller that is also a DNS and DHCP server.

Site 1
DC IP 192.168.2.2
Subnet 255.255.254.0
DHCP Range 192.168.2.1 - 192.168.2.254
Exclusions 192.168.2.1 - 192.168.2.50 (Reserved for servers and printers)
Exclusions 192.168.2.180 - 192.168.2.254

Backup Scope to Site 2
DHCP Range 10.168.2.1 - 10.168.2.254
Exclusions 10.168.2.1 - 10.168.2.180

Site 2
DC IP 10.168.2.2
Subnet 255.255.0.0
DHCP Range 10.168.2.1 - 10.168.2.254
Exclusions 10.168.2.1 - 10.168.2.50 (Reserved for servers and printers)
Exclusions 10.168.2.180 - 10.168.2.254

Backup Scope to site 1
DHCP Range 192.168.2.1 - 192.168.2.254
Exclusions 192.168.2.1 - 192.168.2.180

Since the DC's are at different sites and subnets is this the proper way to set it up? Would I have to configure superscopes? I would say there are about 70 users at each site.

Thanks
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Commented:
Hi, technically you should use a superscope at both sites.  And for remote DHCP to work you will need to configure your router as a DHCP relay agent or helper.  It may be new enough where you don't have to do this.

You should look at this technet article, example 3:

http://technet.microsoft.com/en-us/library/cc757614(WS.10).aspx

HTH

Author

Commented:
On the local DHCP server, I would create the scope for the local DHCP and create the scope for the DHCP server on the other site. Vise versa on the other DHCP server. Then on each DHCP server I would use the superscope option to combine them?
Commented:
To supply IP addresses from a DHCP server located on Site1 to clients on Site2--you'll set up a superscope on Site1. To this superscope, you'll add one or more child scopes, which will supply IP addresses to clients on Site2.

Because you're concerned only with creating additional scopes to support clients on Site2, you don't need to include the scope for Site1 as part of the superscope.  If you are then yes, you are correct and you would add it in as part of the superscope.

As most--probably all--modern routers have DHCP/BOOTP relay agent support, as described in RFC 1542, you probably won't need to set up another server as a DHCP relay agent. So all you'll need to do is configure the router (or have it configured) with its relay agent set to point to the IP address of the DHCP server.  ****Do Not setup either of the servers as a DHCP relay agent.  DHCP will no longer work if you do this.  Just do it on the router level****

HTH

Author

Commented:
Still a little confused on the area.

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