Some domains don't resolve.

[Barry Margolin]

In article <g2aeee$1bb9$1 at sf1.isc.org>, Kevin Darcy <kcd at chrysler.com> 
wrote:

> Barry Margolin wrote:
> > But if your ISP has 100,000 users of the same caching server, it will be 
> > cached if any of 1,000 users have accessed it recently.  For any one of 
> > them, there's only a 0.1% chance that their lookup will be the one that 
> > has to wait for fetching from the source.
> >   
> And if you have 100,000 users using the same caching server, it's likely 
> to experience big spikes of activity (e.g. several thousands of queries, 
> within the course of less than a second), during which time some users 
> will experience some extra delay in getting their queries resolved.

Certainly if the nameserver is not engineered to handle the load it's a 
bad idea to use it as a forwarder.  That's a completely different issue 
than whether it's useful to share caches via a forwarding hierarchy.

-- 
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
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