Date: Fri, 31 Jan 2020 11:55:23 +0000 From: "Niall O'Reilly" <Niall.oReilly+freebsd@no8.be> To: wolfgang@lyxys.ka.sub.org Cc: freebsd-stable@freebsd.org Subject: Re: local_unbound: How to prevent caching of SERVFAIL? Message-ID: <68C871EF-4008-47B4-B5A8-D1FFA2CCBFB8@no8.be> In-Reply-To: <202001291031.00TAVsMk081303@saturn.lyxys.ka.sub.org> References: <202001291031.00TAVsMk081303@saturn.lyxys.ka.sub.org>
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On 29 Jan 2020, at 10:31, wolfgang@lyxys.ka.sub.org wrote: > using local_unbound on FreeBSD 11.3 I have the problem that an > occasional SERVFAIL is cached for several minutes (not sure about the > exact length of time but something like 5 to 15 minutes). Is it possible > to reduce this to something like 10 seconds? Browsing the unbound.conf manpage and thinking about what kind of fault would lead to a SERVFAIL, I get the idea that, if there is a relevant configuration parameter, it might be either infra-host-ttl or infra-cache-min-rtt. The latter, if it helps at all, will likely do so by addressing a possible underlying cause (upstream timeout) of the SERVFAIL. But I'm guessing. I'm sure there are people on the unbound-users@nlnetlabs.nl who can give an authoritative (sic!) answer. Niall O'Reilly
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