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There are 2 types of DNS for NLB - regional and zonal. you should use regional DNS names and AWS will automatically resolve to zonal DNS in a round robin fashion; the reason is if you are using zonal DNS and if there is AZ level outage (unlikely but possible) there wont be any failover therefore its recommended to use Regional DNS of NLB for connectivity. See more information on this topic here
If you are using a single NLB deployed across multiple Availability Zones, you can use the Availability Zone-specific DNS names provided by the NLB in your DNS configuration. For example, suppose you have a workload, www.example.com
, that operates behind an NLB in us-west-2a, us-west-2b, and us-west-2c. It has a Regional AWS provided DNS A record of my-load-balancer.elb.us-west-2.amazonaws.com
, as well as zonal records for each Availability Zone such as us-west-2a.my-load-balancer.elb.us-west-2.amazonaws.com
.
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Thanks for that answer and the link for the DNS explanation! The second EIP showed up in DNS a couple days later. I'm not clear why the second EIP took so long to propogate.