Hi Doug On Fri, Oct 18, 2013 at 04:46:06PM +0800, Doug wrote: > Hello, > > $ idig plus.google.com mx > plus.google.com. 1200 IN CNAME plus-china.l.google.com. > plus-china.l.google.com. 600 IN MX 40 alt3.aspmx.l.google.com. > plus-china.l.google.com. 600 IN MX 50 alt4.aspmx.l.google.com. > plus-china.l.google.com. 600 IN MX 10 aspmx.l.google.com. > plus-china.l.google.com. 600 IN MX 20 alt1.aspmx.l.google.com. > plus-china.l.google.com. 600 IN MX 30 alt2.aspmx.l.google.com. > > I never saw this type of MX. Are they valid records?
I don't get a CNAME result here (in India), but this is quite similar to
what RFC 2317 (Classless IN-ADDR.ARPA delegation) does with CNAME for
PTR type. Here is an example:
dig -x 149.20.53.1
(Note that RFC 2317 is a "best practice" only, i.e., it does not require
any extra protocol support.)
Mukund
pgpQJPVxMlmpB.pgp
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