Jeroen Massar wrote: > On 2018-05-30 16:44, Per Jessen wrote: >> According to RFC1034 and 2181, a PTR record using a CNAME is not >> permitted. I believe this to still be correct, postfix certainly >> doesn't work with a CNAME when it does a reverse lookup. > > Postfix certainly does as: > > $ dig +short 50.131.144.213.in-addr.arpa. ptr > 50.63-28.131.144.213.in-addr.arpa. > citadel.ch.unfix.org. > > would otherwise not work.... and that trick of CNAME'ing in-addr.arpa > space is used a lot by ISPs to delegate space (as per the above > example where init7 forwards them to my nameservers). > > There is also a nice RFC on that: > https://www.ietf.org/rfc/rfc2317.txt
Okay, thanks for clarifying that - I was wondering. I don't why my postfixes come up with host name 'unknown'. -- Per Jessen, Zürich (28.8°C) http://www.dns24.ch/ - your free DNS host, made in Switzerland. _______________________________________________ swinog mailing list [email protected] http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
