Freeradius load balancing.

[nick]

At the moment we have a freeradius 1.1.3 server on CentOS which is 
functioning fine, but due to circumstances, and the devices we are using 
as NASes, the ip pools are located on the NAS instead of being 
centralized on the RADIUS server as we'd like it.

We'd now like to make things a bit more robust, including a clustered 
MySQL backend for AAA, and, if possible, load balanced freeradius 
servers on the front end.

We'd also like to use SQL ip pools. I am only unsure about one thing 
though. If we have a shared pool available via DB, what prevents the two 
load balanced radius instances from giving out the same ip address?

I've been doing a fair bit of googling, but without a whole lot of luck 
in this respect.

Thanks for any info,

Nick Warr.