Re: [DNSOP] valid value range for SOA REFRESH/RETRY/EXPIRE

Mark Andrews <marka@isc.org> Thu, 17 October 2019 23:49 UTC

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From: Mark Andrews <marka@isc.org>
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Date: Fri, 18 Oct 2019 10:49:40 +1100
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Subject: Re: [DNSOP] valid value range for SOA REFRESH/RETRY/EXPIRE
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> On 18 Oct 2019, at 10:46 am, 神明達哉 <jinmei@wide.ad.jp>; wrote:
> 
> At Fri, 18 Oct 2019 10:25:29 +1100,
> Mark Andrews <marka@isc.org>; wrote:
> 
> > > one obvious interpretation is that REFRESH/RETRY/EXPIRE are signed 32
> > > bit integers.
> > 
> > They are all intervals.  How do you have a negative interval?
> 
> I actually didn't expect they can be negative.  My main question is
> whether values larger than 2^31-1 should be considered valid.

Well they are in range.  That said slaves can and do apply sanity
checks to these values.  Both too low and too high cause operational
problems.

Mark

> --
> JINMEI, Tatuya

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org