freeradius 1.7
 
nas1 - localhost
 
nas2 - 222.x21.xxx.2
 
sqlippool
 
nas1-user-1  pool_key 1
nas1-user-2  pool_key 2
..
..
nas2-user-1 pool_key 7
nas2-user-2 pool_key 9
..
..
 
sometimes and randomly
 
nas1-user-5  login .... Be assigning ==> pool_key 9 
(nas2-user the same pool_key)
 
nas2-user-6  login .... Be assigning ==> pool_key 2
(nas1-user the same pool_key)