[radsecproxy] load balancing across multiple servers in realm config

Hi, I've got realm * { server eduroam1.york.ac.uk accountingServer eduroam1.york.ac.uk server eduroam2.york.ac.uk accountingServer eduroam2.york.ac.uk server eduroam3.york.ac.uk accountingServer eduroam3.york.ac.uk server eduroam4.york.ac.uk accountingServer eduroam4.york.ac.uk } in my radsecproxy.conf. Is ther a way to load balance auth request over all the defined servers, or is it a case of "use 1st one till it is unavailable then try the next one" ? Rgds Alex