Sometimes users get host unknown
Andrew Watkins
andrew at dcs.bbk.ac.uk
Tue Jun 13 10:23:38 UTC 2006
Hi,
We have had an ongoing problem that some people (over the world) that
they can not access our web server, since they do not get an IP address.
I have tested from my home ISP (away from work) and am unable to get the
same errors. I have tested the DNS from a few web sites www.dnsstuff.com
, etc and can not pin point any major problem
Our webserver has many addresses
www.lkl.ac.uk
www.lonklab.ac.uk
www.londonknowledge.ac.uk
The last report we had from a user was: dig +trace +qr www.lkl.ac.uk
; <<>> DiG 9.2.1 <<>> +trace +qr www.lkl.ac.uk
;; global options: printcmd
. 47891 IN NS c.root-servers.net.
. 47891 IN NS b.root-servers.net.
;; Received 356 bytes from 165.225.198.2#53(165.225.198.2) in 5 ms
uk. 172800 IN NS NS1.NIC.uk.
uk. 172800 IN NS NSD.NIC.uk.
;; Received 493 bytes from 192.33.4.12#53(c.root-servers.net) in 48 ms
ac.uk. 172800 IN NS ns1.cs.ucl.ac.uk.
ac.uk. 172800 IN NS ns2.ja.net.
ac.uk. 172800 IN NS ns3.ja.net.
ac.uk. 172800 IN NS ns4.ja.net.
ac.uk. 172800 IN NS sunic.sunet.se.
ac.uk. 172800 IN NS ws-fra1.win-ip.dfn.de.
ac.uk. 172800 IN NS ns.uu.net.
ac.uk. 172800 IN NS ns0.ja.net.
;; Received 233 bytes from 195.66.240.130#53(NS1.NIC.uk) in 129 ms
lkl.ac.uk. 86400 IN NS ns1.lonklab.ac.uk.
lkl.ac.uk. 86400 IN NS mail1.ccs.bbk.ac.uk.
;; Received 101 bytes from 128.16.5.32#53(ns1.cs.ucl.ac.uk) in 150 ms
dig: Couldn't find server 'ns1.lonklab.ac.uk': Name or service not known
Any pointers?
Thanks in advance,
Andrew Watkins
*****************************************************************************
Unix Administrator tel: 020-7631 6720
Computer Science Department fax: 020-7631 6727
Birkbeck College (University of London)
Malet Street
London e-mail: andrew at dcs.bbk.ac.uk
WC1E 7HX
http://www.dcs.bbk.ac.uk/~andrew
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