Parent is a CNAME
Joseph S D Yao
jsdy at tux.org
Wed Dec 2 03:50:29 UTC 2009
On Tue, Dec 01, 2009 at 04:59:16PM -0800, Hans Jacobsen wrote:
> If a.stanford.edu is a cname (say to b.stanford.edu)
> can I delegate subdomain.a.stanford.edu? Are there documents that
> point to this being an ok or bad practice?
>
> I know all records for a.stanford.edu are relegated to records for
> b.stanford.edu
> What about subdomains?
No.
The domain that has a CNAME must never appear on the left-hand side of
another record.
If you delegate, the domain appears on the left side of NS records.
If you include the domain in a declaration in the same zone, it still is
on the left side of a record - just not alone.
a CNAME b
; Delegate a - WRONG
a NS ns1 [WRONG]
; Use a on LHS - WRONG
subdomain.a A 7.8.9.10 [WRONG]
subdomain.a NS ns1.subdomain.a [WRONG]
ns1.subdomain.a A 7.9.11.13 [WRONG]
Why not do this?
subdomain.b A 7.8.9.10
subdomain.b NS ns1.subdomain.b
ns1.subdomain.b A 7.9.11.13
--
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** Joe Yao jsdy at tux.org - Joseph S. D. Yao
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