Change DHCP server DNS Address in Azure

@Johnny Broe

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

Historically, it was not feasible to deploy a DHCP Server in Azure due to platform restrictions.

• See : Can I deploy a DHCP server in a virtual network?
• Azure virtual networks provide DHCP service and DNS to Azure Virtual Machines. However, you can also deploy a DHCP Server in an Azure VM to serve the on-prem clients via a DHCP Relay Agent.

DHCP servers in Azure were previously considered not feasible since the traffic to port UDP/67 was rate limited in Azure. However, recent platform updates have removed the rate limitation, enabling this capability.

I don't see a mention of using a DHCP for VMs in Azure.

Even from this blog post,

• https://techcommunity.microsoft.com/blog/azurenetworkingblog/custom-dhcp-support-in-azure/4089674

I don't see the mention of using a DHCP server to provide IP Addresses to VMs in Azure

May I ask,

• Was the existing DC (Windows 2012R2 domain controller) providing DHCP Services to Azure VMs?
  • I believe this is not the case, please confirm
• So when you say "The DHCP server is on an IP address 168.63.129.16"
  • This is actually a virtual IP Address.
  • See : What is IP address 168.63.129.16?
• If you'd like to use the server as a target for an on-premises DHCP relay agent to provide dynamic IP address allocation to on-premises clients,
  • You can consider : Deploy a DHCP server in Azure on a virtual machine
• However, for Azure VMs, I doubt this is feasible as of today

Hope this helps.

Thanks,

Kapil

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