Re: DRAFT-IETF-X400OPS-DNSX400MAPS-03.TXT

[Christian Huitema <[e-mail]>]

=> 
=> Hallo again Christian,
=> 
=> maybe I understand now better what you mean:
=> 
=> >This is fine, but you should only use one format.
=> >
=> >	*.nrc.it.             IN  PX  0  nrc.it#PRMD-nrc.ADMD-acme.C-it	
=> >and 	*.ADMD-acme.X42D.it.  IN  PX  0  it#ADMD-acme.C-it
=> >NOT	*.ADMD-acme.X42D.it.  IN  PX  0  ADMD-acme.C-it#it
=> 
=> Am I correct to read it as:
=> 
=> 1) for rfc822 to X.400 mapping you should use the format:
=> 
=>        *.nrc.it.             IN  PX  0  nrc.it#PRMD-nrc.ADMD-acme.C-it
=> 
=> 2) for X.400 to rfc822 mapping you should use the format:
=> 
=>        *.ADMD-acme.X42D.it.  IN  PX  0  it#ADMD-acme.C-it
=> 
=> 3) for X.400 to rfc822 mapping you should NOT use the format
=> 
=>        *.ADMD-acme.X42D.it.  IN  PX  0  ADMD-acme.C-it#it
=> 
=> because the process always know in which direction is converting, and thus
=> it is confusing to swap <x400-in-dns-syntax>#<rfc822-domain>.
=> 
=> Do I get your suggestion correctly now?
=> 

Yes, absolutely. Using exactly one format, with exactly one meaning, i.e.
"this DNS domain matches that X.400 domain" has the benefit of a stateless
table, and avoids the risk of confusion that someone may cause if using CNAMEs
or other tricks.

Christian Huitema