TTL problem wih bind 8.3.6 cache

[Matus UHLAR - fantomas]

Hello,

I have set up bind 8.3.6 (FreeBSD 4.9) and I have a problem with its caching
features.

There is a domain opalmultimedia.sk, delegated to IP 195.168.11.130, for
which bind sometimes forgets the delegation data - it knows the NS RR, but
forgets the A RR.

(yes, there are some problems with the delegation, but I don't think they
are causing my problem)

It happens, when I restart the server and first I ask for
'A www.opalmultimedia.sk' and then for 'MX opalmultimedia.sk':

uhlar at fantomas% dig www.opalmultimedia.sk @rns3

;; ANSWER SECTION:
www.opalmultimedia.sk.  38400   IN      CNAME   opal.opalmultimedia.sk.
opal.opalmultimedia.sk. 38400   IN      A       195.168.11.130

;; AUTHORITY SECTION:
opalmultimedia.sk.      38400   IN      NS      opal.opalmultimedia.sk.

;; ADDITIONAL SECTION:
opal.opalmultimedia.sk. 38400   IN      A       195.168.11.130

uhlar at fantomas% dig mx opalmultimedia.sk @rns3

;; ANSWER SECTION:
opalmultimedia.sk.      38400   IN      MX      16 opal.opalmultimedia.sk.

;; AUTHORITY SECTION:
opalmultimedia.sk.      38400   IN      NS      opal.opalmultimedia.sk.

;; ADDITIONAL SECTION:
opal.opalmultimedia.sk. 38385   IN      A       195.168.11.130
                        ^^^^^
                        |||||
It seems that BIND updates the NS record for the zone, as long as it came in
AUTHORITY section, but does NOT update the A record, because it came in
ADDITIONAL section. Then, in 38385 seconds, bind will know that
multimedia.sk is delegated to 'opal.multimedia.sk' but won't know its IP
address and thous won't be able even to find it.

Can anyone tell me, if this behaviour is correct? Did I made a mistake
somwehere? Or, where lies the main problem, except the fact that the domain
really should be delegated to more servers, probably in more domains? 

Thank you.


I'm pasting records the server 195.168.11.130 returns, they seem OK to me.

uhlar at fantomas% dig www.opalmultimedia.sk @195.168.11.130
                        
;; ANSWER SECTION:
www.opalmultimedia.sk.  38400   IN      CNAME   opal.opalmultimedia.sk.
opal.opalmultimedia.sk. 38400   IN      A       195.168.11.130

;; AUTHORITY SECTION:
opalmultimedia.sk.      38400   IN      NS      opal.opalmultimedia.sk.

uhlar at fantomas% dig mx opalmultimedia.sk @195.168.11.130

;; ANSWER SECTION:
opalmultimedia.sk.      38400   IN      MX      16 opal.opalmultimedia.sk.

;; AUTHORITY SECTION:
opalmultimedia.sk.      38400   IN      NS      opal.opalmultimedia.sk.

;; ADDITIONAL SECTION:
opal.opalmultimedia.sk. 38400   IN      A       195.168.11.130


-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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