Bind 8 caching problems

[Gildas PERROT]

Hi,

Regularly, I notice some problems with my Bind 8.2.2p5 servers (one on Solaris 
2.6 and one on FreeBSD 3.3). For certain zones for which they are not 
authoritative, they are unable to answer to requests due to their cache.

Ex :

; <<>> DiG 8.2 <<>> @hyperbate www.livinghair.com 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 6
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;;      www.livinghair.com, type = A, class = IN

;; AUTHORITY SECTION:
com.                    2h17m14s IN SOA  A.ROOT-SERVERS.NET. 
hostmaster.internic.NET. (
                                        2000020700      ; serial
                                        30M             ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum


;; Total query time: 1 msec
;; FROM: vectra.francenet.fr to SERVER: hyperbate  193.149.97.80
;; WHEN: Tue Feb  8 10:17:29 2000
;; MSG SIZE  sent: 36  rcvd: 113

The contents of the cache :

;livinghair     10496   IN      SOA     A.ROOT-SERVERS.NET. 
hostmaster.internic.
NET. (
;               2000020700 1800 900 604800 86400 );com.;NXDOMAIN        ;-$
;Cr=auth

$ORIGIN livinghair.com.
;www    10464   IN      SOA     A.ROOT-SERVERS.NET. hostmaster.internic.NET. (
;               2000020700 1800 900 604800 86400 );com.;NXDOMAIN        ;-$
;Cr=auth

If I restart the server, the cache is emptied and the problem is solved.
It seems that the cache is not expired after the TTL of the record.

Any idea about that problem ?

How often is it suggested to restart named ?

Thanks in advance for your help.			Gildas.

-- 
Gildas PERROT, perrot at francenet.fr         __o
FranceNet, 28 rue Desaix, 75015 Paris ---_ \<,_
http://www.francenet.fr            ---- (_)/ (_)