Assign DNS server when authenticate

I have a freeradius: FreeRADIUS Version 2.1.12, for host i486-pc-linux-gnu, I need it to assign dns when authenticating, is it possible? How can I do this? Best regards, FreeRADIUS Version 2.1.12, for host i486-pc-linux-gnu, built on Dec 16 2012 at 22:03:33 Copyright (C) 1999-2009 The FreeRADIUS server project and contributors. Enviado desde Outlook<http://aka.ms/weboutlook>