I have a win2003 dhcp server which validates both MAC addresses and requires the clients to provide a pre-defined user-class (eg 0x103dff. When clients do not provide the user-class, they do not get a gateway but only an IP and netmask. This works perfectly with Windows clients but I can't seem to be able to get Linux clients to work. My clients are Fedora 5 or RedHat 9. The file I have been trying to manipulate is the /etc/dhclient.conf. Any guidance with this will be much appreciated. I'm fairly new to the Linux world.