3rd Party DHCP Server in Azure

Question

3rd Party DHCP Server in Azure

Daniel Shelton 1

I found some information saying that DHCP does not work full scale from Azure if you are using a 3rd party DHCP server due to rate limiting. Is this true? Is there a workaround? Does this also apply to ExpressRoute deployments?

KapilAnanth-MSFT 49,536 Reputation points Microsoft Employee Moderator

2022-09-13T13:50:48.87+00:00

Hi @Daniel Shelton ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are trying to use a 3rd Party DHCP in Azure VNet.

This is not supported as of now and is not recommended.
Refer: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#what-protocols-can-i-use-within-vnets

Please do let us know if you have any queries on this.

Cheers,
Kapil.

2 answers

Your answer

KapilAnanth-MSFT 49,536 Reputation points Microsoft Employee Moderator

2022-09-13T13:50:48.87+00:00

Hi @Daniel Shelton ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are trying to use a 3rd Party DHCP in Azure VNet.

This is not supported as of now and is not recommended.
Refer: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#what-protocols-can-i-use-within-vnets

Please do let us know if you have any queries on this.

Cheers,
Kapil.

Answer 1

Anonymous

You cannot run a DHCP server in Azure. DHCP is provide for on Azure.

You can use TCP, UDP, and ICMP TCP/IP protocols within VNets. Unicast is supported within VNets, with the exception of Dynamic Host Configuration Protocol (DHCP) via Unicast (source port UDP/68 / destination port UDP/67) and UDP source port 65330 which is reserved for the host. Multicast, broadcast, IP-in-IP encapsulated packets, and Generic Routing Encapsulation (GRE) packets are blocked within VNets.
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#what-protocols-can-i-use-within-vnets

--please don't forget to upvote and Accept as answer if the reply is helpful--

Anonymous

2022-09-14T12:49:42.34+00:00

Just checking if there's any progress or updates?

--please don't forget to upvote and Accept as answer if the reply is helpful--

Answer 2

KapilAnanth-MSFT 49,536 Microsoft Employee Moderator

Hi @Daniel Shelton ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are trying to use a 3rd Party DHCP in Azure VNet.

This is not supported as of now and is not recommended.
Refer: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#what-protocols-can-i-use-within-vnets

Please do let us know if you have any queries on this.

Cheers,
Kapil.

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Wim De Pauw 0 Reputation points

2023-02-20T07:36:16.37+00:00

Hi,

The feedback of Microsoft is quite confusing because it also states the following:

Azure VNets provide DHCP service and DNS to VMs and client/server DHCP (source port UDP/68, destination port UDP/67) not supported in a VNet. You cannot deploy your own DHCP service to receive and provide unicast/broadcast client/server DHCP traffic. You can deploy a DHCP server on a VM with the intent to receive unicast DHCP relay (source port UDP/67, destination port UDP/67) DHCP traffic. A possible scenario is configuring DHCP relay from devices on-premises to an Azure VM running a DHCP server. Customer is responsible for configuring on-premise devices (for example, router configuration) to create this DHCP relay traffic to the VM's IP in Azure.

Now what I understood is that Microsoft is rate-limiting these DHCP packets. Is this correct ?

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3rd Party DHCP Server in Azure

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