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ibombonato/til_external_azure_cloud_ip_firewall.txt

Created January 29, 2026 21:22
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TIL: Get public IP of Azure/Cloud VMs when there is none in the interface
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til_external_azure_cloud_ip_firewall.txt
TIL: If you need to give firewall access to a VM that just have internal IP in Azure to another Azure VM, in another subscription, you can use `curl ifconfig.me` to discover the external ip from the machine, and allow in the other machine.
Deal was:
Subscription #1 form person one has one VM with only private ip, that need to access a VM in Subscripton #2 from person 2. So, they are anot connected in any way.
Due VM #1 has "private only IP", something like 172.168.X.X, We could not allow it in VM#2.
How we solve:
In VM #1, run: `curl ifconfig.me` it will then show a "external ip", like 20.168.X.X. Add this IP in the "Allow List"of VM #2 and it worked.
We also allowed outside connection for the public IP of VM #2 in the configs of VM #1
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