How setup secondary DHCP server
Hi All, I have question about my DHCP servers, i have to DHCP servers one of Head office and other user for branch office. 2 servers have more than one scope. Branch office scopes (servers IP 10.200.146.2) 10.200.141.1 to 10.200.141.252 10.200.152. 200 to 10.200.152. 209 10.200.134. 132 to 10.200.134. 142 Head office scope (servers IP 10.200.145.112) 10.200.140.1 to 10.200.140.252 10.200.145. 64 to 10.200.145.99 10.200.152. 11 to 10.200.152.126 10.200.152. 132 to 10.200.152.158 10.200.152. 164 to 10.200.152.190 10.200.170.5 to 10.200.170.200 10.200.171.1 to 10.200.170.30 10.200.171.65 to 10.200.171.126 I want to make my network like this, Q1. Branch office server primary for the Branch office and if the server fails clients must receive the IP address from the Head office DHCP server
May 20th, 2010 10:28am

Unfortunately, there is no ‘automatic’ failover for DHCP. You can create a scope and disable it on the 2<sup>nd</sup> DHCP server. If 1<sup>st</sup> server goes down, you can enable the scope on the 2<sup>nd</sup> DHCP server and change IP Helper address on the router to the 2<sup>nd</sup> DHCP server. Clients will receive IP address from the 2<sup>nd</sup> sever based on the IP Helper configuration and ‘router’ configuration inside the scope. Santhosh Sivarajan | MCTS, MCSE (W2K3/W2K/NT4), MCSA (W2K3/W2K/MSG), CCNA, Network+ Houston, TX http://blogs.sivarajan.com/ http://publications.sivarajan.com/ This posting is provided "AS IS" with no warranties, and confers no rights.
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May 20th, 2010 11:42pm

Hi Chinthaka.De.Silva, I agree with Santhosh Sivarajan’s idea. I have also have an idea for you reference. There is 80/20 design rule for balancing scope distribution of address which deploys the 80% address space on Head Office DHCP's scope and the other 20% on Branch Office. The delay value configuration will control the priority level of two or more DHCP server. The Branch DHCP will not assign the address for head office client until the head office's DHCP down. Once the DHCP service in HQ is down, Breach Office's DHCP will assign the IP address for HQ office clients. Please remind that you have to enable the DHCP rely on each subnet's route of RRAS server, with which DHCP broadcast packet can cross the subnet. You can easily migration your exist DHCP scopes with the new design "Split Scope" wizard in windows 2008/2008 R2. Here are the articles for you reference: DHCP Step-by-Step Guide: Demonstrate DHCP Split Scope with Delay on a Secondary Server in a Test Lab http://technet.microsoft.com/en-us/library/ee405264(WS.10).aspx DHCP Best Practices http://technet.microsoft.com/en-us/library/cc780311(WS.10).aspx Thanks. Tiger Li
May 25th, 2010 4:05am

Hi Chinthaka.De.Silva, If there is any update on this issue, please feel free to let us know. We are looking forward to your reply. Thanks, Tiger Li
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May 27th, 2010 4:58am

Hi thanks for Santhosh Sivarajan and Tiger Li, I have test this with my infrastructure i can't migrate server 2008 so i have creates both scope in servers and keep down in scopes for if i needed .. but i hope to test Tiger Li method could you explain more this Li , and if any possibility continue this on 2003 thanks again for advices Chinthaka
June 14th, 2010 11:00am

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