On Thu, Jan 15, 2009 at 02:30:54PM -0800, Rich Shepard wrote:
> On Thu, 15 Jan 2009, Victor Duchovni wrote:
>
>> You don't need to run your own DNS server provided your cache does not
>> forward cache misses to the ISP. A local cache is sufficient.
>
> Victor,
>
> I assume that dnscache does forward misses up the line, and apparently
> zen.spamhaus.org never made it into the local cache.
This misses the point, the main thing is that a cache can either delegate
all cache misses to a single forwarder, or can directly query the proper
servers for each domain by obtaining the NS records from the parent domain
and so on up to the root servers.
The TTL for RBL zones is generally fairly short, so unless a single botnet
IP is repeatedly hitting your system, indeed the cache hit rate for the
Zen zone may be modest.
--
Viktor.
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