Hi there
Sure hope someone can solve this one, will save me an 8 hour round trip, but more importantly hours of my life.
PROBLEM
[root@mediasrv01 ~]# ping
www.bbc.co.uk
ping: unknown host
www.bbc.co.uk
Essentially this, but not quite.....
[root@mediasrv01 ~]# nslookup
www.bbc.co.uk
;; connection timed out; no servers could be reached
[root@mediasrv01 ~]# nslookup
www.centos.org
Server: 213.248.100.54
Address: 213.248.100.54#53
Non-authoritative answer:
Name:
www.centos.org
Address: 72.232.194.162
[root@mediasrv01 ~]# host
www.mysql.com
;; connection timed out; no servers could be reached
[root@mediasrv01 ~]# host
www.ebay.co.uk
;; connection timed out; no servers could be reached
[root@mediasrv01 ~]# host
www.booktribes.com
www.booktribes.com has address 195.12.232.9
[root@mediasrv01 ~]# host
www.dell.com
www.dell.com is an alias for www1.ins.dell.com.
www1.ins.dell.com has address 143.166.224.244
[root@mediasrv01 ~]# nslookup
www.myspaced.com
Server: 213.248.100.54
Address: 213.248.100.54#53
Non-authoritative answer:
www.myspaced.com canonical name = myspaced.com.
Name: myspaced.com
Address: 68.178.254.123
[root@mediasrv01 ~]# nslookup
www.myspace.com
;; connection timed out; no servers could be reached
OK maybe the name server .... well nope, changed to another on a different ISP network.
And do a:
service network start
first then....
Notice the spelling mistake in MYSQACE
[root@mediasrv01 ~]# nslookup
www.mysqace.com
Server: 195.12.1.1
Address: 195.12.1.1#53
Non-authoritative answer:
Name:
www.mysqace.com
Address: 66.45.252.237
Name:
www.mysqace.com
Address: 66.45.252.236
[root@mediasrv01 ~]# nslookup
www.myspace.com
;; connection timed out; no servers could be reached
But then....
[root@mediasrv01 ~]# nslookup
www.mytube.com
;; connection timed out; no servers could be reached
AND FROM A DIFFERENT machine...
nslookup
www.mytube.com
Server: ptn-cdns02.plus.net
Address: 212.159.6.10
Non-authoritative answer:
Name:
www.mytube.com
Address: 209.62.20.159
###############################################
So what is the setup, right the server is running CentOS 4.4 it is behind a transparent hardware firewall, I can ping out on IP and FQDN (if it resolves), I can ssh in from the public side (network does not drop and is not flaky)
Three network cards, unfortunately I have found that the setup is not that intelligent as it seems to assign the device mappings an unordered manner. Three onbaord NICS a dual 1Gb and a single 100Mb (all onboard)
eth0 is assigned to the 100Mb and eth1 and eth2 to the 1Gb NICs.
The public interface is running on eth1 and the private side is running on eth0 - due to the fact I need 1Gb connectivity on the public side, being a media server
I figured it may have been an issue with the eth0 and eth1 eth0 being the PRIMARYDEVICE, so I changed the modprobe.conf and changed the e100 to eth1 and the e1000 to eth0, swapped the ifcfg-eth0 and eth1 and editted the DEVICE in both and set them to the appropriate devices, this did not solve it.
So now I am stuck on intermittent but somewhat structured resolution failures, almost as if DNS name requested where hashed to work or fail...
Thanks anyone that can shed some light on this dire situation. Yes it is dire because my life is just ticking away