Configure DHCP on Backup Domain Controller at Remote Site

dongocdung
dongocdung used Ask the Experts™
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I just built the backup domain controller 2008 at remote site including DNS, GC. GP. I want to configure DHCP on this DC so that if the main site is down, other remote site still have connection using this backup domain controller. Computer clients are using DHCP to obtain IP address. Could you provide me some resources how to do this task.
Thank you
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Top Expert 2013
Commented:
you can use an 80/20 or 70/30 split scope,  on 2008 they actually have a wizard that takes you through it

http://blogs.technet.com/b/teamdhcp/archive/2009/01/22/how-to-configure-split-scope-using-wizard.aspx


Thanks

Mike

Author

Commented:
At this time,  I don't have the second DHCP server yet.
Top Expert 2013
Commented:
ok so without a second DHCP you really can't have DHCP redundancy

If the main site is down will those clients be able to reach the remote site?  make sure that remote site is listed as a DNS server in those clients in the main site.   That DC should handle them if the main DC goes down.

Thanks

Mike
Check below link:

1. How to Setup DHCP Server in windows server 2008 Step by step Guide
http://www.windowsreference.com/windows-server-2008/how-to-setup-dhcp-server-in-windows-server-2008-step-by-step-guide/

Author

Commented:
Do we need to configure the second DHCP on backup domain controller at remote site? The remote clients are using the DHCP. If the main site down, they don't have the network connection. We plan that if the main site down, they can have the network connection using the second DHCP at remote site. I don't know how to do that. I have researched online but i don't see any document how to do that. if you know whare i can have it, please show me.
Thanks
Top Expert 2012
Commented:
DHCP server can be on any server it is not required to be on the DC.

Here is the thing if the clients are at the remote site and there is a DHCP server then the clients will use the local DHCP server. I recommend having a DHCP server at the remote site so it can handle the IP leasing for the local subnet. You should configure the scope options so that it points to the local DC for primary DNS.
Yes, second DHCP is recomonded for redundancy at remote site.

Check below links for configuration:
1. Need Clarification on Setting up Second DHCP Server for Redundancy
http://forums.techarena.in/windows-server-help/699273.htm

2. How to setup DHCP redundancy (50/50) on Windows 2008
http://www.howtonetworking.com/server/w2008dhcp7.htm

Author

Commented:
We have about 10 remote sites but we need only one second DHCP at one of these remote sites.It has the different subnet with main site.
Joseph MoodyBlogger and wearer of all hats.

Commented:
Just start up the Add Roles Wizard in Server 2008. Select DHCP. It will help you devide scopes.
Please go through above link which posted by me(How to Setup DHCP Server in windows server 2008 Step by step Guide),  that will give you all answer with GUI steps about how to configure DHCP, how to Create new scope for different subnet.

Author

Commented:
I got it now.
Thanks for your ideas

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