[dns-operations] Too Open (Was: OpenDNS makes your Internet work better

[Nicholas Suan]

On 7/13/06, Rodney Joffe <rjoffe at centergate.com> wrote:

> > Right, but when the cluster nearest to you is broken and the
> > routing table forces all your packets to that IP address to be
> > delivered to that cluster, then all zones served by UltraDNS are
> > broken, at least as far as you can tell.
>
> H'mmm. I'm interested in what form of routing foo you're apparently
> aware of that would allow packets from you to a specific IP address
> to *ever* go to a different location when the "closest" location to
> you is broken, but the route still exists. Could you share? And how
> that relates to "all zones served by UltraDNS are broken, at least as
> far as you can tell"? What do zones have to do with clusters, or routes?
>

Who says there's any routing-fu involved? In the root zone, (I use it
as an example since some of the nodes are anycasted) if one server
times out, it's no problem for a resolver to go and check another
instance of the root, which will most likely be located someplace that
isn't malfunctioning. This was not the case with UltraDNS, as both IP
addresses in the NS records for org. were anycasted.