[LINK] DNS outage?
pbrooks-link at layer10.com.au
Wed Jul 29 09:03:04 AEST 2009
Jan Whitaker wrote:
> At 11:24 PM 28/07/2009, Paul Brooks you wrote:
>> Road traffic needs out-of-band notification, as it has no inherent
>> in-band rerouting mechanism - drivers unaware of a problem will continue
>> to drive into the trouble zone.
>> The Internet has BGP-4.
> What ever happened to the Internet rerouting itself so it 'can't be
> broken'? Or was that always a myth? I thought its resilience was one
> of its big selling points.
On a large scale, that was the reference to BGP-4 - which is the routing
protocol between networks that steers traffic around broken
links/routers, generally updating the global routing table within a few
This does depend on there being a different path for traffic to be
re-routed onto. In practice if you happen to be very close to the cause
of the break (or your intended traffic source/sink is), there may not be
another path to steer traffic onto.
None of which has anything to do with a DNS outage in the subject line
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