Forum Discussion
Azure Default Routes Explanation or what is the purpose of 100.64.0.0/10 IP range in Azure
I have simple question to Azure team. Is there any document which describes purpuse of each Azure default routes?
How Azure uses 100.64.0.0/10 IP range?
I was playing with File Service and SAS tokens. I have created file servce and generated new SAS token with IP restriction. I restricted access to the single IP, which is public IP of the VM I deployed into the same subscription as this Files service. When I tried to access a file in this file service with provided URL, I got message access denied from the IP address. To my surprize the IP address which was listed in access denied message was not my public IP but 100.79.88.46. I fond that this IP belongs to the range of one of the Azure Default routs. ({100.64.0.0/10} Null Active Default )
If I go to this URL form VM in different subscription or from workstation I can see that my IP address is properly identified.
- chronictechieMicrosoft
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview
https://tools.ietf.org/html/rfc6598
It's a transition address space to handle multiple NAT addresses. Typically only used by carrier grade networks.