DHCP Server Question

[forgiven]

Server 2012 R2 running DHCP role. This has been working flawlessly for years. What i'm seeing are clients (both wireless and wired) not able to contact the DHCP server and don't get a valid ip address. I suspect some type of VLAN issue but have been asked to look first at the DHCP role. So for troubleshooting reasons, i want to disable ipv6 on the dhcp server/role. We don't use ipv6 in any way on our network. So how does one turn off dhcp server ipv6 in server 2012 r2?

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