Does anyone have actual data on how common it is, so we can make an informed decision?
I would expect "www.something..." to be in the same zone as "something..." in most cases, so I think it is actually very common to have more than one level on the same DNS. -- Bob Harold hostmaster, UMnet, ITcom Information and Technology Services (ITS) rharo...@umich.edu 734-647-6524 desk On Mon, Jan 5, 2015 at 11:33 AM, Paul Hoffman <paul.hoff...@vpnc.org> wrote: > On Jan 4, 2015, at 12:13 PM, David Conrad <d...@virtualized.org> wrote: > >>> "Sending the full qname to the authoritative name server is a > >>> tradition, not a protocol requirment." > >>> > >>> I'd actually call it an optimization, not a tradition. > >> > >> In many cases, sending the full qname degrades performance so I would > >> not call it an optimization. > > > > If there are cases in which sending the full QNAME degrades performance, > it might be useful to document them in the draft (off the top of my head, I > can't imagine non-broken cases where that would be true, but I haven't > thought about it too long). > > > > The reason I'd call it an optimization is that in the case where a > server is authoritative for multiple layers of hierarchy, sending the full > QNAME allows that server to bypass the referrals for all intermediate > layers of hierarchy and simply respond to the depth it knows. If QNAME > minimization is applied, that shortcut isn't possible. > > +1 to David's comment. I have always heard that sending the full name was > an optimization for authoritative severs that spanned more than one level, > and that such servers were common in "the early days". It is worth pointing > this out in this draft, and to also say that that situation may be much > less common now than it was in antiquity. > > --Paul Hoffman > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop >
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