Ok, first of all, not everybody has the resources to afford an "expert" to do something... besides, this is a university project, is not something that im doing for a company or something, hence im not getting an expert...thats the reason im in a forum, this is what they are for...otherwise i would have got an expert and not posting in forums anyway...if someone wants to help me...this is what i got my router is a ENHWI-N3, i've got its firewall disabled it's got DHCP server enabled, wan //dinamic ip address Lan// 192.168.0.1 subnet mask 255.255.255.0 i tried to ping Centos ip adress 192.168.75.129 from the AP but is unreachable but when i do the ping to 127.0.0.1 it's alive so the radius server should it be 192.168.75.129 or 127.0.0.1? In clients.conf i have client 192.168.0.1 { secret = xxxx nastype= other } i did a nc -zu 192.168.01 1800 1820 and 1812 its working fine its succeeded and i did it for 127.0.0.1 too and its fine. so..this is it...i appreciate if someone could tell me what could it be wrong..