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

Simon Munton Simon.Munton at CommunityDNS.net
Mon Jul 30 10:31:21 UTC 2012

> 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")

> If this is true, is it a stretch to see this impacting traffic
> patterns on a host whose traffic is almost 100% mobile devices, more
> so than other, standard websites using round robin?

We've seen this issue with a client who has mostly mobile end devices 
and they're (very) not happy.

Currently Google will serve out an IPv4 list in the same order they are 
given it, so if the Authoritative server does round robin, and there is 
a short TTL, then you can (kind of) force Google to.

However, (IMHO) relying on the weird co-incidence that Google serves 
addresses in the same order they are received is not good practice.

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