> > My Question here is, What sort of system load can I expect from doing this? > We currently have 200+ users on the box and all seems well, but what happens > when we get to 1000+ etc, will it still hold up? Is it a potential > bottleneck, or is it clean enough?
for me, considering RDBMS, yes. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html

