Cameron Beattie wrote:
Cameron Beattie wrote:
I have the following issue where wget won't resolve a domain name the
first time I try it. It will only resolve the name once I do an
nslookup.
Please post the output of:
$ grep hosts /etc/nsswitch.conf
#hosts: db files nisplus nis dns
hosts: files dns
That looks OK.
Is the nameserver at 192.168.0.253 reliable?
Try looking up an IP address that you haven't tried recently and see if
it returns the same results every time, e.g.
The results are different the second time, see below:
$ dig @192.168.0.253 www.uit.no
; <<>> DiG 9.2.5 <<>> @192.168.0.253 www.uit.no
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44895
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 3
;; QUESTION SECTION:
;www.uit.no. IN A
;; ANSWER SECTION:
www.uit.no. 86400 IN CNAME w3s2.uit.no.
w3s2.uit.no. 86400 IN A 129.242.5.89
;; AUTHORITY SECTION:
uit.no. 56830 IN NS benoni.uit.no.
uit.no. 56830 IN NS nac.no.
uit.no. 56830 IN NS lozen.uit.no.
;; ADDITIONAL SECTION:
nac.no. 67455 IN A 129.240.2.40
lozen.uit.no. 71859 IN A 129.242.5.254
benoni.uit.no. 56830 IN A 129.242.4.254
;; Query time: 768 msec
;; SERVER: 192.168.0.253#53(192.168.0.253)
;; WHEN: Tue Nov 1 18:31:07 2005
;; MSG SIZE rcvd: 170
$ dig @192.168.0.253 www.uit.no
; <<>> DiG 9.2.5 <<>> @192.168.0.253 www.uit.no
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39902
;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.uit.no. IN A
;; ANSWER SECTION:
www.uit.no. 10000 IN A 129.242.5.89
;; Query time: 4 msec
;; SERVER: 192.168.0.253#53(192.168.0.253)
;; WHEN: Tue Nov 1 18:31:51 2005
;; MSG SIZE rcvd: 44
Hmm, that's interesting. Your nameserver appears to be returning bad data,
though curiously the first answer was the right one in this case.
I wonder if this is a problem with a caching service such as nscd? You
could possibly try restarting nscd if you're using that.
service nscd status
nscd is stopped
I'm not really familiar with caching services so I'll read up a bit more
about them. Maybe there's one running that I don't know about. Or maybe I
should be running one and I'm not.
Is 192.168.0.253 your machine, or some other machine on the network?
192.168.0.253 is a D-Link ADSL router. I'll have a look for a firmware
upgrade just in case. I have another similarly configured Linux machine
which doesn't have these problems.
Thanks
Cameron
