[LINK] RFI: Telstra DNS outage

[Avi Miller]

Hi,

> On 13 May 2016, at 9:02 AM, Roger Clarke <Roger.Clarke at xamax.com.au> wrote:
> 
> Is the largest provider in the country utterly incompetent?
> Or is there something important about Internet architecture that I fail to understand?

It's most likely that Telstra are AnyCasting their DNS servers:

https://en.wikipedia.org/wiki/Anycast

Essentially this means that they have a single IP address that is routed to the nearest actual DNS server to the requester. And that there can be lots and lots of backends for this.

Cheers,
Avi