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Re: MTAMARK and RFC 2317, was Re: HELO and Unified

2004-09-15 10:00:56

On Wed, 15 Sep 2004, william(at)elan.net wrote:

There are also some issues with RFC2317 (which is in my opinion just a
bad RFC that instead of proposing to do futher reverse subdelegation
with NS, tried to get by with CNAMEs - bad, that means it will only work
for PTR records and not anything else that might be in in-addr).

What makes you think that? To extend an example from RFC 2317:

   $ORIGIN 2.0.192.in-addr.arpa.
   @       IN      SOA     my-ns.my.domain. hostmaster.my.domain. (...)
   ;...
   0/25            NS      ns.A.domain.
   1               CNAME   1.0/25.2.0.192.in-addr.arpa.

   $ORIGIN 0/25.2.0.192.in-addr.arpa.
   @       IN      SOA     ns.A.domain. hostmaster.A.domain. (...)
   @               NS      ns.A.domain.
   1               PTR     host1.A.domain.
                   TXT     "ASRG.MTA=yes"

The CNAME refers to the whole RR set, not any particular RR type.

Tony.
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