On Sat, Jul 14, 2007 at 08:09:15PM +0200, martin f krafft wrote: > my understanding of CNAME records is that an MX may not be a CNAME > record, but I thought something like > > users=> select * from pdns.records where name like 'wall.%'; > domain_id | name | type | content | ttl | prio | change_date > -----------+------------------+-------+--------------------+-------+------+------------- > 8 | wall.madduck.net | CNAME | oerlikon.no-ip.org | 86400 | | > 8 | wall.madduck.net | MX | a.mx.madduck.net | 86400 | 10 | > 8 | wall.madduck.net | MX | b.mx.madduck.net | 86400 | 99 | > > should be possible. Yet, dig (and bind9 host) don't like it: Quote the RFC 2181: : 10.1. CNAME resource records : : [...] An alias name (label of a CNAME record) may, if DNSSEC is in : use, have SIG, NXT, and KEY RRs, but may have no other data. [...] Yeah, it looks like CNAME excludes other RRs. I did not know that either, but I guess it does make sense. Choosing which records override which could get complicated if CNAME could be mixed with other data. Though I do not know if that is actually a problem for existing software. -- Tmi Juha-Matti Tapio Puh/Tel. +358-50-5419230 Y-tunnus 1911527-0 Fax +358-9-34756631
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