Anycast DNS

[Oliver Garraux]

On Wed, Feb 29, 2012 at 8:33 AM, takizo <paulooi at takizo.com> wrote:
> Ju,
>
> What do you mean on more than one address?
>
> --
> Paul Ooi
>
>
>
> On Feb 29, 2012, at 11:55 AM, ju wusuo wrote:
>
> Have seen some anycast DNS implementations using more than one address, some
> times even on the same subnet, any considerations or reasons for doing
> that?
>
>

I assume he's asking why Google has 8.8.8.8 and 8.8.4.4, and why
whoever runs 4.2.2.2 has 4.2.2.1, 4.2.2.2, etc.  I don't have an
answer.  They may have to announce at least a /24 for BGP peers to
accept the routes.  But 8.8.8.8 and 8.8.4.4 aren't in the same /24, so
that doesn't make sense there.

Oliver