ISP network design of non-authoritative caches

Alex Bligh alex at
Sun Nov 18 10:19:22 UTC 2001

--On Saturday, 17 November, 2001 4:48 AM -0500 Sean Donelan 
<sean at> wrote:

> We know this isn't good engineering practice, because another national
> ISP with millions of subscribers configured their network the same way,
> and experienced a multi-hour service disruption affecting most of their
> users a couple of years ago when an error blocked access to their two
> caching-only, name servers.

You mean there are national ISPs out there, who have exactly 2
caching nameservers, as opposed to configure their clients with
2 IP addresses (perhaps always the same 2) which perform name
resolution? Wow. Is this some sort of retro fashion?

Alex Bligh
Personal Capacity

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