[dns-operations] Google Public DNS and round robin records

[Klaus Darilion]

On 22.07.2012 18:19, Mark Jeftovic wrote:
>
> Am I right in thinking that Google public DNS simply does not cycle the
> multiple records on a round-robin host. There have been a few threads on
> this (i.e. google "round robin 8.8.8.8")
>
> At first I thought this was just impacting a specific customer domain
> but now it seems to be the same for any round-robin host I care to try
> against it:
>
> markjr at c3po:~$ dig +short rr.easypi.net @8.8.8.8
> 205.210.42.3
> 205.210.42.1
> 205.210.42.2

...

Relying on round-robin has other short-comings too. E.g. if more 
developers use getaddrinfo() instead of gethostbyname() (which is 
obsolete) then the results will always be ordered, e.g. see:
http://daniel.haxx.se/blog/2012/01/03/getaddrinfo-with-round-robin-dns-and-happy-eyeballs/

regards
Klaus