Handling of target IP addresses in rule for outbound endpoint

Question

I have some rules for forwarding domains using outbound endpoints in the Route 53 resolver.  I specify multiple target IP addresses in each one.  
  
I can find no documentation on the handling of the list of IP addresses.  Does the resolver start at the top of the list and fail-over only as needed, round-robin over all the addresses, or....?   This behavior does have some implications for how I optimize the list of targets.  
  
Thanks.

Answer

Hi,  
  
I updated the doc. In the section "Values That You Specify When You Create or Edit Outbound Endpoints," see "Order of IP addresses":  
  
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resolver-forwarding-outbound-queries.html#resolver-forwarding-outbound-queries-endpoint-values  
  
Thanks for raising the question.  
  
Scott

Answer

Hi,  
  
I checked with the devs, and they said, "The order of the IP addresses has no effect on which target Resolver chooses." I'll add that to the doc.  
  
Scott

Answer

Thanks.

Handling of target IP addresses in rule for outbound endpoint

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