ISP network design of non-authoritative caches

Bill Woodcock woody at
Sat Nov 17 10:52:26 UTC 2001

    > During the boom times, ISPs couldn't individually configure millions
    > of DNS clients.  They generally told subscribers to use two statically
    > configured name servers.

Many of them, like us, tell subscribers to use two statically configured
_service addresses_ which describe the internal-DNS _service_, and are
resident on all customer-facing DNS servers throughout our infrastructure.

The only reason to give them two addresses rather than one is to keep the
clueless ones from complaining about lack of redundancy.  Both addresses
are typically hosted on all machines, though.


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