Backup Domain Controller at Remote Site

dongocdung
dongocdung used Ask the Experts™
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Hi all,
I just install the Windows Server 2008 Backup Domain Controller at remote site. We have only one domain and have multiple sites. At remote sites, computers are configured to use DHCP.  If the domain controller at main site is down so we will have connection provided from backup domain controller at remote site. So employees still can access to intranet and resources.

Do I need to configure the DHCP on Backup Domain Controller at remote site?
Thanks
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yes, you will have to have a dhcp server role setup at the remote site, but make sure not to allow your IP ranges to overlap or you may get duplicates on your network
Top Expert 2013
Commented:
You could have them use DHCP at your main site too...I've seen it done both ways.

Is the new DC in remote site also a global catalog server?  Are you running DNS on your domain controllers?  If you are make the new box a DNS server too and have the local clients point to it for primary DNS.

Thanks

Mike

Author

Commented:
Yes, we have DHCP at main site. I also configure the backup domain controller at remote site for GC, DNS but not yet for DHCP. if we don't configure DHCP at remote site, the computers which use DHCP cannot connect to our network when the DC at main site is down, can they?
Top Expert 2013

Commented:
no they could not reach DHCP in that case; but how long are your leases?  If they are the default of 8 then the connection would have to be down for a few days before it really had any real impact.  (clients try to renew at 50 percent of their lease times)

Thanks

Mike

Author

Commented:
at the corporate office is set for 2 days. Some sites are for 8 days and the other sites are for 15 days
Top Expert 2012
Commented:
You must make sure that the clients at the remote sites point to their local DNS servers if not the clients will not authenticate to their local DC. Clients instead will look to the main DNS server then authenticate to that DC.

Also, you need to setup Sites within AD Sites and Services.

Author

Commented:
ALl clients at remote site use DHCP to get IP address so we don't need to point clients to their local DNS. They will look to the DHCP server. I already setup Sites within AD Site and Services.
Top Expert 2012

Commented:
Does the DHCP point to their local DNS servers?

Author

Commented:
At this backup domain controller, I just configured the AD, DNS but not yet for DHCP. I just plan and make sure i do correctly. We also will test this backup domain controller. However, I will have DHCP point to their local DNS server.
Thanks
Top Expert 2012

Commented:
In DHCP you should point clients to both DNS servers. Your secondary DC needs to  be GC as well so you need to go into AD Sites and Services then go to NTDS setting for the DC and check GC option.

Author

Commented:
Yes, I have that backup domain controller as GC. I will configure DHCP on that DC later.
Thank you for your help

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