Corey is correct. Record not found does not mean dns server is unreachable, failover only occurs if dns server is unreachable on port 53.
From: rhelv5-list-boun...@redhat.com [mailto:rhelv5-list-boun...@redhat.com] On Behalf Of Corey Kovacs Sent: Thursday, March 01, 2012 10:23 AM To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: Re: [rhelv5-list] strange DNS resolution or lack off They are tried in sequence if the first fails to talk to a server at all, not if a record isn't found. What you need is to have your internal DNS forward lookups to the external DNS that are not handled by the internal. C On Mar 1, 2012 8:12 AM, "Gerhardus Geldenhuis" <gerhardus.geldenh...@gmail.com<mailto:gerhardus.geldenh...@gmail.com>> wrote: Hi I have a freshly build rhel5u7 server from the DVD not updated. It has two interfaces: DEVICE=eth0 ONBOOT=yes HWADDR=00:0C:29:6B:78:6C TYPE=Ethernet BOOTPROTO=static IPADDR=10.10.10.102 NETMASK=255.255.255.0 DNS1=10.10.10.4 DNS2=192.168.9.1 and DEVICE=eth1 ONBOOT=yes HWADDR=00:0C:29:6B:78:76 TYPE=Ethernet BOOTPROTO=dhcp DNS1=10.10.10.4 DNS2=192.168.9.1 PEERDNS=no I have a custom /etc/resolv.conf search example.com<http://example.com> nameserver 10.10.10.4 nameserver 192.168.9.1 If I run the command host myserver.example.com<http://myserver.example.com> I get Host myserver.example.com<http://myserver.example.com> not found: 3(NXDOMAIN) However if I disable the second name server (192.168.9.1) it works. Now to explain the 10.10.10.4 server is my own dns server and the 192.168.9.1 server is the dns server for all external dns lookups. The docs says nameserver entries in /etc/resolv get tried sequentially but it does not seem to happen for me. I did a strace but I could not see anything significantly different between the two lookups with different /etc/resolv.conf files. I would appreciate anyone shedding any light on the problem. ipv6 is disabled Regards -- Gerhardus Geldenhuis _______________________________________________ rhelv5-list mailing list rhelv5-list@redhat.com<mailto:rhelv5-list@redhat.com> https://www.redhat.com/mailman/listinfo/rhelv5-list
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