Find NLB IPs the documented way #605
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DNS lookups are not a reliable way to find all of an NLB's listener IPs. There is no guarantee that the DNS server will give your machine all valid listeners, and there may be more than two. Instead, use an AWS documented technique to find all network interfaces associated with an NLB to get those network interfaces' IPs. Use those IPs for the target group for the public NLB.
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DNS lookups are not a reliable way to find all of an NLB's listener IPs. There is no guarantee that the DNS server will give your machine all valid listeners, and there may be more than two.
Instead, use an AWS documented technique to find all network interfaces associated with an NLB to get those network interfaces' IPs. Use those IPs for the target group for the public NLB.