Interaction of CNAME and A records with regard to TTL
Tim Maestas
tmaestas at dnsconsultants.com
Thu Jan 23 02:50:11 UTC 2003
On Wed, 22 Jan 2003 Mark_Andrews at isc.org wrote:
>
> > Hi,
> >
> > thank your for your answers. A follow-up question: how about the TTL of
> > CNAME records and the records they point to, is there a constraint that they
> > have to be equal? (I assume that not.)
>
> Correct.
One note that may be worth mentioning - the Microsoft Windows 2000
caching resolver will cache both the CNAME and the A record that
it points to at the same TTL. If the TTL's are different then
it will cache at the lower of the two (thereby putting them
within the *letter* of the RFC, but, IMHO, not the spirit.
-Tim
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