[Unbound-users] Increase of requestlist entries/connection timeout due to groupinfra.com domain

Slingerland, Michael van Michael.van.Slingerland at t-mobile.nl
Mon Feb 21 13:45:37 UTC 2011


I've been scratching my head for a few days now, trying to figure out what is happening here.
1) I noticed that the requestlist dump contains about 200 subdomains for groupinfra.com, some of them are there for up to 85000 seconds.

2) 1 entry in the requestlist is:
215    A IN xjdjtallrd.groupinfra.com. 25205.720826 iterator wants A IN de-dc002.groupinfra.com. A IN in-dc007.groupinfra.com. A IN uk-dc015.groupinfra.com.

Resolving this domain with dig returns:

# dig @localhost xjdjtallrd.groupinfra.com

; <<>> DiG 9.4.2-P2 <<>> @localhost xjdjtallrd.groupinfra.com
; (1 server found)
;; global options:  printcmd
;; connection timed out; no servers could be reached

3) flushing the requestlist and name from the cache

#  dig @localhost xjdjtallrd.groupinfra.com

; <<>> DiG 9.4.2-P2 <<>> @localhost xjdjtallrd.groupinfra.com
; (2 servers found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 65121
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;xjdjtallrd.groupinfra.com.     IN      A

groupinfra.com.         3107    IN      SOA     uk-dc001.groupinfra.com. hostmaster. 15046308 900 600 86400 900

;; Query time: 0 msec
;; WHEN: Mon Feb 21 14:38:14 2011
;; MSG SIZE  rcvd: 98


After a few hours the domain is again not resolvable as in point 2.

Flushing the requestlist and domain groupinfra.com from cache fixes again this issue.

I am using unbound 1.4.7 on OpenBSD 4.5.

Compile options:
./configure --prefix=/opt/unbound-1.4.7 \
--with-ssl=/usr \
--with-libevent=/usr \
--without-pthreads \
--with-chroot-dir=/var/unbound \
--with-pidfile=/var/run/unbound.pid \
--with-conf-file=/var/unbound/etc/unbound.conf \
--with-username=named \
--disable-gost \

I'm trying to understand why this domain is only temporaribly resolvable and after it fails, it is resolvable again after a flush of requestlist and domain groupinfra.com.


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