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 -- /*********************************************************************\ ** ** Joe Yao j...@tux.org - Joseph S. D. Yao ** \*********************************************************************/ _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
