Getting "wrong" DNS-Server on DHCPINFORM

[Daniel Domberger]

Oh.. sorry.. seems like my smtp refused to send the message without 
telling me. Here the original one:

Greetings!

Running dhcpd 3.0.3 and dhcpd.conf looks something like this:

#### start of dhcpd.conf
allow unknown-clients;
ddns-update-style ad-hoc;
authoritative;
...
subnet 10.0.0.0 netmask 255.0.0.0 {
range 10.0.10.1 10.0.10.254;
option subnet-mask 255.0.0.0;
option broadcast-address 10.255.255.255;
option domain-name "my.domain.com";
one-lease-per-client on;
default-lease-time 14400;
max-lease-time 14401;
option ip-forwarding off;
option time-offset -18000;
option time-offset -18000;
option routers 10.10.10.10;
option domain-name-servers 10.0.0.9;
ddns-updates on;
ddns-update-style ad-hoc;
ddns-domainname "my.domain.com";
use-host-decl-names on;
}

group { update-static-leases on;

####### Host MAC Adressen

host voyager { hardware ethernet 00:50:fc:72:9a:54; fixed-address 
10.0.0.2; option domain-name-servers 10.0.0.1; option routers 10.0.0.1; 
ddns-hostname
voyager; }
## lot of host entries
....
#### end of dhcpd.conf

What I want is, that known hosts get the options (especially
DNS-Servers) from their host-section and unknown hosts get that one,
from the subnet-section (i.e. 10.0.0.9). This works just fine for
leases. But a lot of windows-clients which are known hosts (e.g.
10.0.0.2) sometimes send DHCPINFORM packets and receive ACKs with
options from the subnet-section (i.e. domain-name-server 10.0.0.9). The
windows-clients then change their DNS to that value from the
subnet-section (interestingly they don't change their gateway-value even
though the ACK-package gives them the 10.10.10.10-value).

Now the question is: How could I get dhcpd to send the options from the
according host-section or just ignore DHCPINFORM packets?