[squid-users] dns_ttl positive/negative Squid 3.5.10
Antony.Stone at squid.open.source.it
Mon Nov 2 15:47:53 UTC 2015
On Monday 02 November 2015 at 16:39:45, FredB wrote:
> I want to reduce DNS requests, so I'm trying with
> positive_dns_ttl 6 hours
> negative_dns_ttl 4 hours
> If I try a false domain like test.google.com there is a response from my
> DNS Servail, so ok But if I retry after a short time - maybe one minute -
> there is again a DNS request
> Same thing with positive_dns_ttl, Squid respects the TTL from DNS
"Upper limit on how long Squid will cache positive DNS responses."
Note: "Upper limit" - not "lower limit", or "forced value".
So, if the DNS response gives you a TTL of 15 minutes, and you've specified an
upper limit of 6 hours, the result is 15 minutes.
The TTL on looking up "test.google.com" is 60 seconds, so you can make your
cache time shorter than that, but you can't make it longer.
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