Qry:- How to assgin DNS server IP address to the client through RADIUS server

Hai all Here i am using freeradius-1.0.2 using for AAA function...and pppoe-server as the client.... Here i need to assgin the DNS ip address to the pppoe-client through the radius..... server... pls tell me which attribute is there to assign DNS IP address.... Also tell me it is possible to assign ip address through the freeradius-1.0.2 (source code) in pppd we are using the patch version ppp-2.4.1b2-vanilla-radclient-v2.0.patch.gz .... With regards Romel