[dns-operations] Too Open (Was: OpenDNS makes your Internet work better
jabley at ca.afilias.info
Thu Jul 20 18:23:46 UTC 2006
On 20-Jul-2006, at 11:47, Florian Weimer wrote:
> * Per Heldal:
>> The issue with UltraDNS desribed in this thread relates to the
>> fact that
>> they used multiple anycast IP's in the same address-block. You get
>> problems if you do that and don't control the infrastructure
>> interconnecting the various anycast locations.
> I don't see what you gain from controlling those interconnects.
You get to route requests for 220.127.116.11 to a different node if
18.104.22.168 is unavailable locally, while 22.214.171.124 still works.
> can't use intra-AS connections anyway because you'd need to run an
> IGP, and your typical IGP is a distributed single point of failure.
Avoiding the shared fate of an IGP between nodes is a win in many
respects, but I wouldn't characterise it as a fundamental no-no.
As with most things, the cost/benefit implications of individual
design decisions vary widely according to exactly what you're trying
to accomplish. Anycast is a wide umbrella, and generalisations are
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