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Lesson Learned #58: Virtual Machine and its Load Balancer IP

Hello Team,

Time Ago I worked in a service request that our customer reported that their outbound IP has changed without any notice. Working on this issue I have found an interested situation to identify IP of the Load Balancer of a virtual Machine running on Azure.

I created two virtual machines using the same VNet.

The first machine has the Public IP:

The second machine has not a Public IP:

When I try to connect to my Azure SQL Database server I have found the following scenarios:

  • The machine without public IP is using an IP Searching the outbound connection for Virtual Machines I have found the following URL that explains this IP is coming from :
  • Running the nslookup I obtained the same IP
  • So, this IP from the Load Balancer may be changed without any notice.


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Lesson Learned #58: Virtual Machine and its Load Balancer IP


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