<div>nas1 ==>  localhost</div>
<div>nas2 ==>  200.300.xxx.1</div>
<div> </div>
<div>sqlippool</div>
<div>UserName NASIPAddress CallingStationID   pool_key </div>
<div>user1         127.0.0.1         111.111.111.22    5</div>
<div>
<div>user2         127.0.0.1         222.222.222.22    4</div>
<div>
<div>user3         127.0.0.1         333.333.333.22    7</div></div></div>
<div> </div>
<div>user4 login ...........</div>
<div>user3 NASIPAddress CallingStationID   => blank</div>
<div>user3 pool_key ==> 0</div>
<div>user4  pool_key  ==> 7 <br></div>
<div>sqlippool</div>
<div>
<div>UserName NASIPAddress CallingStationID   pool_key </div>
<div>user1         127.0.0.1         111.111.111.22    5</div>
<div>
<div>user2         127.0.0.1         222.222.222.22    4</div>
<div>
<div>user3                                                          0</div></div></div></div>
<div>
<div>user4         127.0.0.1         444.444.444.22    7</div>           </div>