question about caching of lame servers

Barry Margolin barmar at
Wed Oct 18 03:57:57 UTC 2006

In article <eh44qj$1bi1$1 at>,
 Kevin Darcy <kcd at> wrote:

> Klaus Darilion wrote:
> > That gives faster timeouts - but I want to get rid of timeouts 
> > completely - of course the first lookup will time out, but the name 
> > servers should be marked as down for some time and sequential lookups 
> > should be avoided.
> >   
> I think you're setting yourself for a very fragile and fickle lookup 
> subsystem, since we're talking primarily about an unreliable protocol 
> (UDP) being used over long-distance networks with varying latencies. 
> Packet delays and drops are commonplace.

But BIND already retries the original queries.  If all the queries to 
all the nameservers for a domain fail, it's unlikely to be due to 
transient problems like this.

And the cached down state would presumably have a reasonable timeout 
(which could be configured in named.conf, of course), so the failure 
shouldn't produce serious problems.

Barry Margolin, barmar at
Arlington, MA
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