Some background:
We are running go based applications on ubuntu servers on AWS. Recently we started having DNS round-robin issues where one of the load balancers (ELB) will end up handling a large portion of the traffic(~ 5:1) and thus overloading the load balancer.
After some investigation, we came across rfc3484 and issues associated with it that explained the behaviour that we were experiencing. Seeing how the rfc is mostly catered towards ipv6, we then decided to try disabling ipv6 and see what happens. Somehow, that magically solved our problems.
Can someone explain to me why would disabling ipv6 at the source also disable the sorting that is done in getaddrinfo?
Note: The ELBs that we are using do not support ipv6. Only the source is configured to have ipv4 and ipv6 by default.