#StackBounty: #amazon-web-services #load-balancing #amazon-elb Why does only one of the multiple address records for my ELB work at a s…

Bounty: 150

I’m using an elastic load balancer. When I issue nslookup dualstack.app.elb.us-east-2.amazonaws.com, the output is

Non-authoritative answer:
Name:   dualstack.app.elb.us-east-2.amazonaws.com
Address: 3.xxx.xxx.176
Name:   dualstack.app.elb.us-east-2.amazonaws.com
Address: 18.xxx.xxx.40

I noticed each of these IPs is in a different availability zone and that only one of the IPs is valid at a single time. Making a request to dualstack.app.elb.us-east-2.amazonaws.com/healthcheck via curl only works half of the time. However making the same request from my browser works 100% of the time because of how chrome has its own method of handling round-robin DNS (related: https://serverfault.com/a/774411, https://serverfault.com/a/852421)

Is this the intended behavior of ELB, that when multiple IPs are present, only one of them is expected to work at a time?

Get this bounty!!!

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