An ISP need to use NAT to let its subscribers access internet because of limited number of available public IP addresses. The requirements are as follows: 1- In order to reduce the amount of NAT IPDR (Internet Protocol Detail Record) data that will be sent to Telecommunications Communication Presidency, each user in NAT applications should be assigned a certain range of ports. For example, assuming a range of 200 ports is defined by the operator for each user, when a subscriber with a private IP address of 10.0.0.1 wants to make a connection over the actual IP, a port range of 10000: 10200 for that actual IP address is allocated to that user. 2- A port or port range assigned to a user; after being wasted for at least one hour, it is appropriate to allocate it to a different user Is there way to configure this in freeradius or is it purely a nas procedure? Thanks.