Well, finally I found the problem? NAT has its own DHCP (which was enabled) Now I got another problem that probably you guys have before? In this network, I can?t use usb flash memories? I use the usb flash on any machine, but on the desktops who belongs to this domain, there is no possible?. Probably, there are some policies that I can?t find which prevent users to create the drives for flash drives? does anyone knows where it is??? Mauricio Fernández S. IT Manager Tel. 591- 445-25160 Fax. 591- 441-15056 mfernandez@xxxxxxxxxxxxxxx www.fdta-valles.org Cochabamba - Bolivia