DHCP Failover: Configure failover failed error 20103 conflict in types for the same option on host and added dhcp server

Evan Alvarez 0 Reputation points
2023-10-20T21:10:09.39+00:00

I am trying to set up a DHCP Failover on my network with 2 Domain Controllers. The Main is a Microsoft server 2022 and the second one is a Microsoft server 2016. Not sure if that matters. They both have Static IP's within the same Subnet

But when I was setting up the failover, I get error code 20103

https://video2.skills-academy.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn338982(v=ws.11)

https://video2.skills-academy.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn338984(v=ws.11)

I followed the pre-req and the setup guides but still recieved the error

Windows DHCP
Windows DHCP
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.DHCP: Dynamic Host Configuration Protocol (DHCP). A communications protocol that lets network administrators manage centrally and automate the assignment of Internet Protocol (IP) addresses in an organization's network.
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  1. Evan Alvarez 0 Reputation points
    2023-10-20T21:26:38.45+00:00

    I found the answer after looking at this post, https://www.tumblr.com/bcolbyb/141046994325/dhcp-gotcha?redirect_to=%2Fexplore%2Ftoday&source=blog_view_login_wall

    Inside the DHCP console, if you right click the IPV4 option, you'll see Set predifined options, Click it.

    Now go over the options that are there and ensure that that the information is the same on both Domain Controllers. Also make sure data types are the same. The Secondary Server that will be the failover must match the Primary DHCP server Predefined settings

    In my situation the information was the same except for the Data type on two options. So once I changed it, I was able to set up the failover successfully.

    I hope this provides more guidance as I didn't see much advice on this online

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