DHCP failover for disaster recovery site

I must set up a failover DHCP server in a different remote site on Windows Server 2008 R2.

What's the best method to set up a DHCP failover server?

Thank You in advanced :)
artcrestAsked:
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Sylvain_pivSystem AdministratorCommented:
You can use 80/20 method.

On your first DHCP Server allow it to offer ip about 80 % of your range (like 192.168.1.1 to 192.168.1.180).

On your second DHCP, allow it to offer 20 % of your range (192.168.1.181 to 192.168.1.254).

http://technet.microsoft.com/en-us/library/cc958936.aspx
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Peter HutchisonSenior Network Systems SpecialistCommented:
We have a failover setup for DHCP. Its a manual failover so a little bit of work is needed when doing a failover.
Install a second server with the DHCP Service installed. Leave DHCP service disabled.
On the primary server run a scheduled task to use NETSH DHCP DUMP to dump the dhcp scopes to a file and then copy it to a folder on to the second server.
e.g. netsh dhcp dump >dhcpdump.dmp

When a failover occurs, start dhcp on second server (remove any previous config) and run netsh exec with the dump file to re-configure dhcp with the dhcp settings:
e.h. netsh dhcp exec dhcpdump.dmp
The restart the dhcp service to use the new settings.

http://technet.microsoft.com/en-us/library/cc787375%28v=WS.10%29.aspx#BKMK_import
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