Routing traffic on Azure Backbone between different Azure customers

Question

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We currently have a small Azure subscription with a vFirewall and 2 vServers setup on two subnets (vNets) in our Azure subscription but Azure routing is not currently enabled. We would like to
communicate with another Azure customer without using the Public Internet. Communications --between us-- currently uses the Public Internet.
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The question is - if we setup Azure routing (within our Azure subscription, will traffic between us and the other Azure customer use the Azure backbone?
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:Current setup -- No routing Enabled
Azure_Cloud -----vNet_192.168.1.0/24---- vFirewall-----vNet_192.168.0.0/24-----NAT_Public_IP------Public_Internet
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: Future setup -- Auzre Routing Enabled
Azure_Cloud -----vNet_192.168.1.0/24---- vFirewall-----vNet_192.168.0.0/24-----NAT_Public_IP------Azure_BackBone------Other_Azure_Customer
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Thank you
fsebera

Answer 1

Hi @frank sebera ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to use Azure Backbone for connection between two Azure Virtual Networks.

You can consider Azure VNet Cross Subscription Peering

• This, however, takes place using Private IP Ranges. So, you will be required to remove the NAT_Public_IP in between.
• Also, the VNets in picture should not have overlapping IP Addresses.

In case you are planning to use Internet only and still leverage Azure backbone,

• Refer: Routing via Microsoft global network
• Here, the traffic stays in Microsoft for most of the flow, but there is no guarantee that it will stay in MS backbone for 100%
• We recommend you use VNet peering should you wish the traffic never leaves MS backbone.

Hope this helps.

Cheers,
Kapil

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