Linux and Win dns clients against bind 9.2.4 server

Hi,

I have Linux and Windows PCs that are running against the same bind
9.2.4 DNS server. Linux client PC is also running bind 9.2.4 configured
as caching only DNS server.

Surprisingly, Linux caching only client appears to be generating
considerably more requests to the DNS server than the Windows client.
Most likely the Linux caching only client is misconfigured somehow.

To illustrate the point, the following are respective query records sent
by Windows and Linux clients.

Thanks in advance
---------------------------------------------------------------------
$ cat /etc/resolv.conf
# Linux caching only client
search domain.tld
nameserver 127.0.0.1

---------------------------------------------------------------------
$ cat /etc/bind/named.conf.options
// Linux caching only client
.....

options {
directory "/var/cache/bind";
.....
// If your ISP provided one or more IP addresses for stable
// nameservers, you probably want to use them as forwarders.
// Uncomment the following block, and insert the addresses
replacing
// the all-0's placeholder.

// Do not resolve any queries, just forward for the answer.
forwarders {
192.168.1.1;
};
//forward only;

auth-nxdomain no; # conform to RFC1035
};

---------------------------------------------------------------------
-- Windows
Sep 1 13:11:06 srv named[2025]: Sep 1 13:11:06.601 queries: client
192.168.1.4#2945: query: finance.yahoo.com IN A
Sep 1 13:11:07 srv named[2025]: Sep 1 13:11:07.043 queries: client
192.168.1.4#2945: query: us.i1.yimg.com IN A
Sep 1 13:11:07 srv named[2025]: Sep 1 13:11:07.587 queries: client
192.168.1.4#2945: query: us.js1.yimg.com IN A
Sep 1 13:11:07 srv named[2025]: Sep 1 13:11:07.698 queries: client
192.168.1.4#2945: query: us.a1.yimg.com IN A

---------------------------------------------------------------------
-- Linux
Sep 1 16:15:10 srv named[2025]: Sep 01 16:15:10.895 queries: client
192.168.1.2#32768: query: finance.yahoo.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.005 queries: client
192.168.1.2#32768: query: finance.yahoo2.akadns.net IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.007 queries: client
192.168.1.2#32768: query: finance.yahoo2.akadns.net IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.245 queries: client
192.168.1.2#32768: query: us.i1.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.439 queries: client
192.168.1.2#32768: query: a943.x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.440 queries: client
192.168.1.2#32768: query: a943.x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.579 queries: client
192.168.1.2#32768: query: us.js1.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.729 queries: client
192.168.1.2#32768: query: us.a1.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.844 queries: client
192.168.1.2#32768: query: a566.yimg.com.georedirector.akadns.net IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.845 queries: client
192.168.1.2#32768: query: a566.x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.846 queries: client
192.168.1.2#32768: query: n6x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.846 queries: client
192.168.1.2#32768: query: n6x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.847 queries: client
192.168.1.2#32768: query: n0x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.847 queries: client
192.168.1.2#32768: query: n0x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.848 queries: client
192.168.1.2#32768: query: n1x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.848 queries: client
192.168.1.2#32768: query: n1x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.849 queries: client
192.168.1.2#32768: query: n2x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.849 queries: client
192.168.1.2#32768: query: n2x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.850 queries: client
192.168.1.2#32768: query: n3x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.850 queries: client
192.168.1.2#32768: query: n3x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.851 queries: client
192.168.1.2#32768: query: n4x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.851 queries: client
192.168.1.2#32768: query: n4x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.854 queries: client
192.168.1.2#32768: query: n5x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.854 queries: client
192.168.1.2#32768: query: n5x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.855 queries: client
192.168.1.2#32768: query: n7x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.855 queries: client
192.168.1.2#32768: query: n7x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.856 queries: client
192.168.1.2#32768: query: n8x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.856 queries: client
192.168.1.2#32768: query: n8x.a.yimg.com IN A6
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.857 queries: client
192.168.1.2#32768: query: a566.x.a.yimg.com IN A
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.944 queries: client
192.168.1.2#32768: query: n6x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.948 queries: client
192.168.1.2#32768: query: n0x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.952 queries: client
192.168.1.2#32768: query: n1x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.956 queries: client
192.168.1.2#32768: query: n2x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.960 queries: client
192.168.1.2#32768: query: n3x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.964 queries: client
192.168.1.2#32768: query: n4x.a.yimg.com IN AAAA
Sep 1 16:15:11 srv named[2025]: Sep 01 16:15:11.968 queries: client
192.168.1.2#32768: query: n5x.a.yimg.com IN AAAA
Sep 1 16:15:12 srv named[2025]: Sep 01 16:15:12.001 queries: client
192.168.1.2#32768: query: n7x.a.yimg.com IN AAAA
Sep 1 16:15:12 srv named[2025]: Sep 01 16:15:12.008 queries: client
192.168.1.2#32768: query: n8x.a.yimg.com IN AAAA
Sep 1 16:15:12 srv named[2025]: Sep 01 16:15:12.114 queries: client
192.168.1.2#32768: query: chart.finance.yahoo.com IN AAAA
Sep 1 16:15:12 srv named[2025]: Sep 01 16:15:12.170 queries: client
192.168.1.2#32768: query: chart.finance.yahoo.akadns.net IN AAAA
Sep 1 16:15:12 srv named[2025]: Sep 01 16:15:12.175 queries: client
192.168.1.2#32768: query: chart.finance.yahoo.akadns.net IN A
Sep 1 16:15:12

Well, if anyone is interested, things got considerably better once I
removed the "forwarders". Somehow I thought that forwarding requests to
the server with a large cache would make things quicker, apparently it
isn't so...