Thanks Ranil Santhis and Luis Carlos Toledo for your reply, I have read in the PDSN GUI help that the interface for AAA must be a logic interface, then I looked in the PDSN configuration and I found two PI (logical) interfaces, here the part of PDSN config that I think is AAA related: [conf] # interface Piif3/0/0 ip address 192.168.1.2 255.255.255.255 # interface Rpif3/0/0 ip address 192.168.1.1 255.255.255.255 # a11 enable pcf 192.168.0.200 192.168.1.1 256 skey 1234567891234567 # construct domain huawei domain enable domain AAAclientsig 1 domain address-group huawei 0 0 10.0.0.51 50 domain dns huawei 0 209.145.204.26 bip 209.145.204.20 # charge enable weekday 6 1 weekday 5 0 weekday 4 0 weekday 3 0 weekday 2 0 weekday 1 0 weekday 0 1 # [/conf] - Can please tell me if this is what I need to co nfigure the PDSN with the FreeRADIUS? - What should I start configuring in the FreeRADIUS side? - Also, I was googling and didnt found what A11 is and why we need it here, can please tellme something about that? Thanks again guys.