I have three Azure VMs in an availability set which is the target of an ALB which has a public IP address, the intention being to use SNAT so they have a predictable outbound IP. Each VM is behaving as though it is a standard non-load balanced VM with no instance-level public IP. The documentation states;
The Load Balancer resource must be configured with a rule to link the public IP frontend with the backend pool. If you do not complete this configuration, the behavior is as described in the preceding section for Standalone VM with no Instance Level Public IP.
What is this rule? Is it not enough to have the public IP on the load balancer and the VMs in the targeted availability set? Can someone explain where this rule is created?