RADIUS, anycast, and high availability

Hello all, We’re looking into using anycast and a group of servers for some of our stateless services (like DNS and NTP) to increase availability, as anycast “automatically” routes traffic to one machine in a group. I’m wondering if RADIUS is a good candidate for this as well. Being UDP-based is a good start, but I don’t know if the servers will get annoyed if (say) multiple packets in an EAP conversation don’t go to the same server. DNS is much simpler as its usually single-shot (request -> reply). Basically: has anyone else tried it? Or is this a Bad Idea and I just stick to regular multi-server with failover on the NAS? Thanks, Jason