class B delegation

[Barry Margolin]

In article <9vla47$n2t at pub3.rc.vix.com>,
Michael Kjorling  <michael at kjorling.com> wrote:
>Remember the alias law: a CNAME can not point to a CNAME.

RFC 1034 seems to describe this as a good idea, but not quite a "law":

    Domain names in RRs which point at another name should always point at
    the primary name and not the alias.  This avoids extra indirections in
    accessing information.  For example, the address to name RR for the
    above host should be:

	52.0.0.10.IN-ADDR.ARPA  IN      PTR     C.ISI.EDU

    rather than pointing at USC-ISIC.ARPA.  Of course, by the robustness
    principle, domain software should not fail when presented with CNAME
    chains or loops; CNAME chains should be followed and CNAME loops
    signalled as an error.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
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