![]() CNAME records that are served by DNAME records may cause recursive loops in older resolvers.Therefore a CNAME record cannot appear at the zone apex. RFC 1034 section 4.2.1 demands a SOA record at the zone apex and RFC 1034 section 3.6.2 demands that are no other records be present if a CNAME record is present. a CNAME record cannot be present at the zone apex.It is possible, then, to create unresolvable loops with CNAME records, as in: CNAME records that point to other CNAME records should be avoided due to their lack of efficiency, but are not an error.(RFC 1034 section 3.6.2, RFC 1912 section 2.4) The exception is when DNSSEC is being used, in which case there can be DNSSEC related records such as RRSIG, NSEC, etc. If a CNAME record is present at a node, no other data should be present this ensures that the data for a canonical name and its aliases cannot be different. ![]() ![]()
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