You need router that supports that kind of thing.
Something like named access lists. Then you use freeradius to send access list
name to router. Try to find what attributes your router can receive from radius.
Try googling something like "your router name radius attributes".
If not, you can use diferent pools for users that
have ftp access and user that don't have ftp access. For those pools you setup
diferent access lists. After that you just use freeradius to give diferent IP
adresses to users that have ftp access and users that don't have ftp
access.
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