It seems in certain cases PowerDNS does not volunteer the CNAME it has
when asked for a PTR; which will break sites with rfc2317
(http://www.ietf.org/rfc/rfc2317.txt) setup.
We are running r950 out of the SVN trunk with a patch for #118
(http://wiki.powerdns.com/cgi-bin/trac.fcgi/ticket/118).
So for example we have a BIND master with a zone file that looks
something like this:
$TTL 3600
$ORIGIN 222.12.69.in-addr.arpa.
@ IN SOA sonic.net. hostmaster.sonic.net. (
2006121401 ; serial
3600 ; refresh
300 ; retry
1209600 ; expire
3600 ) ; minimum ttl
IN NS a.auth-ns.sonic.net.
IN NS b.auth-ns.sonic.net.
IN NS c.auth-ns.sonic.net.
0-255 IN NS ns1.quantact.com.
0-255 IN NS ns2.quantact.com.
2 IN CNAME 2.0-255.222.12.69.in-addr.arpa.
If you ask the BIND master for the reverse you get the CNAME and glue records:
[augie@augnix ~]$ dig -x 69.12.222.2 @mns1.sonic.net +norecurse
;; ANSWER SECTION:
2.222.12.69.in-addr.arpa. 3600 IN CNAME 2.0-255.222.12.69.in-addr.arpa.
;; AUTHORITY SECTION:
0-255.222.12.69.in-addr.arpa. 3600 IN NS ns1.quantact.com.
0-255.222.12.69.in-addr.arpa. 3600 IN NS ns2.quantact.com.
;; ADDITIONAL SECTION:
ns1.quantact.com. 172121 IN A 64.142.109.250
ns2.quantact.com. 172121 IN A 64.151.119.219
But if you ask one of the PowerDNS authoritative slaves you only get the glue:
[augie@augnix ~]$ dig -x 69.12.222.2 @a.auth-ns.sonic.net +norecurse
;; AUTHORITY SECTION:
0-255.222.12.69.in-addr.arpa. 3600 IN NS ns1.quantact.com.
0-255.222.12.69.in-addr.arpa. 3600 IN NS ns2.quantact.com.
The pertinent bits in the PowerDNS slave DBs look like this:
mysql> select name,type,content from records where domain_id = 17603
and type = 'NS';
+------------------------------+------+---------------------+
| name | type | content |
+------------------------------+------+---------------------+
| 222.12.69.in-addr.arpa | NS | a.auth-ns.sonic.net |
| 222.12.69.in-addr.arpa | NS | b.auth-ns.sonic.net |
| 222.12.69.in-addr.arpa | NS | c.auth-ns.sonic.net |
| 0-255.222.12.69.in-addr.arpa | NS | ns1.quantact.com |
| 0-255.222.12.69.in-addr.arpa | NS | ns2.quantact.com |
+------------------------------+------+---------------------+
and
mysql> select name,type,content from records where content =
'2.0-255.222.12.69.in-addr.arpa';
+--------------------------+-------+--------------------------------+
| name | type | content |
+--------------------------+-------+--------------------------------+
| 2.222.12.69.in-addr.arpa | CNAME | 2.0-255.222.12.69.in-addr.arpa |
+--------------------------+-------+--------------------------------+
