Getting "wrong" DNS-Server on DHCPINFORM

[Glenn Satchell]

Looks like it could be a bug.

Read through this thread for some workarounds.

http://marc.theaimsgroup.com/?l=dhcp-users&m=115321486714301&w=2

regards,
-glenn

>Date: Sun, 14 Jan 2007 13:03:25 +0100
>From: Daniel Domberger <queltos at gmail.com>
>To: dhcp-users at isc.org
>Subject: Getting "wrong" DNS-Server on DHCPINFORM
>
>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?
>
>