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From Axb <>
Subject Re: TTL and DNSBLs (was Re: Why run your own DNS server?)
Date Mon, 04 Jul 2011 20:31:29 GMT
On 2011-07-04 21:26, John Levine wrote:
>> My experiments on real mail servers show that DNS caching is quite
>> ineffective for DNSBLs (at least for typical ones like Spamhaus that
>> use a short TTL on the order of 15-30 minutes.)
> That's consistent with what I've seen, although you probably won't be
> surprised to hear that I have higher hopes for my range published
> DNSxLs than David does, partly because I expect them to be used for
> whitelist which tend to cache better for technical reasons.
> But if you're looking for a DNS cache, I highly recommend unbound.
> I used to use dnscache but got tired of its limitations (due entirely
> to it being unchanged since 1998.)  My copy of unbound runs about
> 27M real RAM, 44M virtual, which is pretty modest on my 12G server.

how many q/s is that instance handling?

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