That's not part of Radius. It happens if:
1) The client supports the PPP extensions that request DNS servers
2) You have them defined in the PM
3) You are using a current ComOS (was added in 3.5 or 3.7 AFAIK)
Thomas Kinnen
USA Anime Archive: http://www.anime.usacomputers.net
Personal Home Page: http://www.sobhrach.com/