On 1 March 2012 15:22, Hugh Brown <hbr...@divms.uiowa.edu> wrote: > On 03/01/2012 09:07 AM, Gerhardus Geldenhuis 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 >> nameserver 10.10.10.4 >> nameserver 192.168.9.1 >> >> If I run the command >> host myserver.example.com I get >> Host 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 >> >> >> > Do you have nscd running? If so, turn it off and retry all of your tests. > If it is still misbehaving, then these are the next things I'd look at. >
nscd is off and caching disabled just in case. I seldom turn on the evil beast. > > Is eth1 on the same subnet as the 192.168.9.1 name server? Which interface > has the default route? > eth1 is not on the same subnet as 192.168.9.1 name server and default route is for eth1. > > What happens when you do a tcpdump of traffic going out on eth0/eth1 to > port 53? > I have'nt done that yet... should have thought about that. Doing that nwo. > > What options did you give strace when you were checking with the > functioning resolv.conf and the broken resolv.conf. > > Hugh > > strace -v -o filename host myserver.example.com Regards -- Gerhardus Geldenhuis
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