STRANGE dns problem

[numlock]

Hello !

I've just installed Mandrake 10.1 Official.
My server has 2 NIC's.
eth0 - 193.226.x.x (going to my ISP)
eth1 - 193.231.x.1 (going to internal LAN)

DNS seems to work only from the server (I have access to whatever www page I want, etc). Email is working perfect both from server and the LAN windoze stations.
The crazy problem is that from stations I can not access web using URLs. If I use IPs I can browse web without problems.
Telnet from stations to server on port 53 is working.

A named restart looks in log like:
May 3 11:00:11 ccoux named[24757]: starting BIND 9.3.0 -u named
May 3 11:00:11 ccoux named[24757]: found 1 CPU, using 1 worker thread
May 3 11:00:11 ccoux named[24757]: loading configuration from '/etc/named.conf'
May 3 11:00:11 ccoux named[24757]: listening on IPv4 interface lo, 127.0.0.1#53
May 3 11:00:11 ccoux named[24757]: listening on IPv4 interface eth0, 193.226.x.x#53
May 3 11:00:11 ccoux named[24757]: listening on IPv4 interface eth1, 193.231.x.1#53
May 3 11:00:11 ccoux named[24757]: command channel listening on 127.0.0.1#953
May 3 11:00:11 ccoux named[24757]: zone 0.0.127.IN-ADDR.ARPA/IN: loaded serial 2005042701
May 3 11:00:11 ccoux named[24757]: zone x.231.193.IN-ADDR.ARPA/IN: loaded serial 2005042511
May 3 11:00:11 ccoux named[24757]: zone localdomain/IN: loaded serial 2005042501
May 3 11:00:11 ccoux named[24757]: zone zone1.ro/IN: loaded serial 2005042502
May 3 11:00:11 ccoux named[24757]: zone zone2.ro/IN: loaded serial 2005042502
May 3 11:00:11 ccoux named[24757]: running

Nothing in errors log!

Please... Can someone make me understand what is happening???

Thanks!

[SilentRage]

Get on one of the stations experiencing dns troubles, and show me the results for the following commands.

ipconfig /all
ping www.google.com
nslookup www.google.com