Cite the RFC please. 1034 says
# Domain names in RRs which point at another name should always point at
# the primary name and not the alias.
and
# domain software should not fail when presented with CNAME
# chains or loops; CNAME chains should be followed and CNAME loops
# signalled as an error.
and
# - The answer to the query, possibly preface by one or more CNAME
# RRs that specify aliases encountered on the way to an answer.
and
# Multiple levels of
# aliases should be avoided due to their lack of efficiency, but should
# not be signalled as an error.
It's fairly clear that CNAMEs to CNAMEs are discouraged, but legal.
-- Aaron Denney -><- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/