On Thu, 14 Jun 2001, Shachar Shemesh wrote:
> An ISP places a cache to save on traffic. putting too low an expire time
> spoils that.
>
> A value that should work OK, at least with some cases I've heard of, is
> 180 (three minutes). It should still give your client a reasonably
> updating service.
Tried with 180s and 300s, and it don't work.
Can someone explain (or point to some FM to RT) exactly what "refresh",
"retry", "expire", and "minimum" in the SOA record of a zone file do?
I can't find any decent documentation for this.
Thanks!
---= Miki Shapiro =------------------
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---= Windows Programmer in Rehab =---
-------------------------------------
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On Thu, 14 Jun 2001, Shachar Shemesh wrote:
> >
> >foreign DNS's keep his entry cached more than the said
> >"expire" (or is it "refresh"?) given 60 seconds, and when he updates my
> >DNS, they don't update off me.
> >
> I have seen several cases of such behaviour, and not only with DNS.
>
> It seems that the various caches throughout the internet don't like too
> short update times. The reason being the same reason such caches were
> placed in the first place.
>
> An ISP places a cache to save on traffic. putting too low an expire time
> spoils that.
>
> A value that should work OK, at least with some cases I've heard of, is
> 180 (three minutes). It should still give your client a reasonably
> updating service.
>
> One good question is what happens if this is, indeed right? Does it fill
> in it's default minimum?
>
> One more point - in some cases (noteably - Windows apps), a single query
> is issued per app per domain per session, regardless of timeout. I have
> seen it written somewhere, but I am not sure where (I think it was a
> reason against DNS load balancing).
>
> Shachar
>
>
>
>
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