Hi, I have a DHCP server handing out addresses from 10.0.1.60 - 10.0.1.250. Our network address is 10.0.0.0 with mask 255.255.253.0. We are running low on addresses and after some investigation we noticed a range that is free (from 10.0.0.101 to 10.0.0.200). As far as I know it is not possible to have two address pool on the same DHCP scope. I know I have two options. I can change the address pool to 10.0.0.101 - 10.0.1.250 and then add an exclusion range or add a second DHCP server and add the new address pool there. My questions - which method is better? Is there any advantage in going with one option or the other? Is there another method that would be preferred over the ones I have mentioned? Let me know if you need more info. Thanks for reading. Qazi

Hi i am assuming 255.255.253.0 is a typo and that it should actualy be 255.255.252.0 in this case you should have 1022 addresses to give out this so because your network address will be 10.0.0.0 and your broadcast will be 10.0.3.255. So your ip address scope for DHCP is possible from 10.0.0.1 to 10.0.3.254 now i think you can create a new scope in dhcp. Open DHCP, right click Server_Name and select new scope. Enter the address range you said is free which is 10.0.0.101 to 10.0.0.200 and the subnet mask 255.255.252.0 and also the other relevant settings for DHCP same as the one in your other scope, activate the new scope as well and i think it should work. Please post up if this does not work or if you need any more info and all tech-nique

Hi tech-nique, Yes, it is a typo but its not 252, its 255.255.254.0 (10.0.0.0 - 10.0.1.255). The idea of creating a second scope is not bad though I wouldn't want to test it out on a live environment. can anyone reading this post conform if this will work? Qazi

I would just modify the scope and add the exlusion range to accomodate the new IPs. Not sure what the concern is. Even if you delete the scope, recreate it, as long as you have Conflict Detection turned on, there will not be an issue with issuing IPs in use. With regard to a second DHCP server...its always a good design to have two servers and split the scope 50/50. Here is some more information to help you: Increasing IP Lease Availability in DHCP http://www.anitkb.com/2010/06/increasing-ip-lease-availability-in.html Using Conflict Detection in DHCP http://www.anitkb.com/2010/03/using-conflict-detection-in-dhcp.htmlVisit: anITKB.com, an IT Knowledge Base.

Hi Qazi, Thanks for posting here. I think it’s depend on you . Both options have their own advantage or disadvantage . For example, with adding new server option , it will improve the availability, however will also spend more time for server maintaining. Design Option 1: Split Scopes http://technet.microsoft.com/en-us/library/dd296651(WS.10).aspx DHCP Best Practices http://technet.microsoft.com/en-us/library/cc780311(WS.10).aspx Thanks. Tiger Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.comPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.