If clients cannot reach the primary server then they can acquire an IP address lease from the secondary server. Split scope deployment does not provide IP address continuity and is unusable in scenarios where the DHCP scope is already running with high address space utilization, a common scenario for IPv4 addressing.
DHCP failover. The wizard automatically replicates scopes and settings from the primary server to the failover partner. Flexible : DHCP failover can be configured to provide redundancy in hot standby mode, or with load balancing mode, client requests can be distributed between two DHCP servers. Seamless : DHCP servers share lease information, allowing one server to assume responsibility for servicing of clients if the other server is unavailable.
Actually that is one of the new features of Windows Than you install the second server with DHCP role and authorized. If you have done this you going back to your first server, where you already configured your scopes. Now right click onto the scope you want to setup for failover and select 'Configure Failover'.
You can than set it up as kind of split scope Load balance Mode or as real fail over setup Hot Standby. With Server R2 the easiest configuration is split scope. But here it depends how many IP leases you will max have and if you can absorb if one of the server is going down. Lets say you have 50 DHCP leases max, than sure, set it up as split scope.
At the end it depends on your environment. Steven Lee. Monday, January 19, PM. Saturday, May 16, PM. I hacked together this script which runs as a scheduled task every 10 minutes on the backup DHCP server.
It routinely grabs a backup copy of the primary DHCP database and checks to make sure the 'Dhcpserver' service is running on the primary server.
If the primary goes down, the script launches 'Dhcpserver' on the backup DHCP server using the most recent database backup it keeps five backups by default. While the primary is down, the script continues checking the primary server, and shuts down the backup service when the primary comes back online. It's ugly, but it does seem to work.
Hopefully it's somewhat useful for you or anyone else out there. If you improve it all, please message me at hgate73 at live. EDIT: This forum butchered the code indentation even after checking "has code"
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