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SubjectRe: DNS goofups galore...
"Michael H. Warfield" wrote:
> On Thu, Feb 08, 2001 at 02:58:30PM -0800, H. Peter Anvin wrote:
> > Followup to: <>
> > By author: Gerhard Mack <>
> > In newsgroup:
> > >
> > > Thanklfully bind 9 barfs if you even try this sort of thing.
> > >
> > Personally I find it puzzling what's wrong with MX -> CNAME at all; it
> > seems like a useful setup without the pitfalls that either NS -> CNAME
> > or CNAME -> CNAME can cause (NS -> CNAME can trivially result in
> > irreducible situations; CNAME -> CNAME would require a link maximum
> > count which could result in obscure breakage.)
> It generally forces another DNS lookup. If you do a resolve on
> a name of type=ANY it returns any MX records and A records. If you then
> do a resolve on the MX records, you then get a CNAME and then have to
> add an additional lookup for the CNAME. If you have a lot of MX records
> and not all the servers are "up" that can add up to a significant
> increase in DNS traffic.

Wouldn't that be true for any CNAME anyway?


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