force the user to use a unique NAS

[Toledo, Luis Carlos]

I have two load-balanced NAS with diferents networks, the users can use the
first or second NAS to gain network access from dynamic ips via rlm_ipool
(two diferents ip pools) radius module.

But now, I need to use unique fix ip from some users.

How can I force the user to use a unique NAS ? If don´t make this, the fixed
ip can be out of network. Make sense?

Thx
Toledo