Peter van Dijk <peter.van.d...@powerdns.com> wrote: > On 31 Mar 2017, at 12:10, Tony Finch wrote: > > > > Does the more ambitious version use the NSEC rdata format so that you can > > have different target names for different alias RR types? > > I got this question some time ago when I was working on ALIAS for PowerDNS. > Back then I said no, as nobody showed me an actual use case for it and I did > not like the extra complexity. Today I feel the same way and the upcoming > draft does not have type bitmaps currently.
That's probably sensible :-) The vague idea I had was ALIAS A AAAA for your web hosting provider and ALIAS MX TXT for your mail hosting provider. But the latter isn't actually very useful, since MX and SPF records have built-in indirection, and TXT is also used for other purposes (domain authorization, quite frequently in my experience), and it doesn't cover DKIM or MUA SRV records. And other scenarios stub their toes in similar ways, e.g. for SIP there's a mess of SRV records plus NAPTR, and a NAPTR RRset can cover multiple unrelated protocols and providers. So I think my conclusion is that ALIAS is both unnecessary and unhelpful for RRtypes other than A and AAAA. Tony. -- f.anthony.n.finch <d...@dotat.at> http://dotat.at/ - I xn--zr8h punycode Trafalgar: North or northeast 4 or 5, increasing 6 at times. Moderate at first in east, otherwise rough. Fair. Good. _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
