Hi All i use Cisco and mikrotik as Access server in my network and i need to limit user access by MAC address. in this case i can use Calling-Station-Id , it works for mikrotik : AUTH Detail Packet-Type = Access-Request Service-Type = Framed-User Framed-Protocol = PPP NAS-Port = 11062419 NAS-Port-Type = Ethernet User-Name = "7622240489" Calling-Station-Id = "90:F6:52:D5:74:96" Called-Station-Id = "EHO-L" NAS-Port-Id = "902- ADSL-EMAM-HOSIEN" NAS-Identifier = "2800gs-langha" NAS-IP-Address = 10.185.3.5 SQL-User-Name = "7622240489" But not work for Cisco : Packet-Type = Access-Request Cisco-AVPair = "client-mac-address=9094.e483.390b" Framed-Protocol = PPP User-Name = "5858222251" NAS-Port-Type = Ethernet NAS-Port = 13145502 NAS-Port-Id = "0/0/2/352" Service-Type = Framed-User NAS-IP-Address = 85.185.83.242 Acct-Session-Id = "00C8959E" NAS-Identifier = "BOJNOORD_7204_1" SQL-User-Name = "5858222251" So how i can Set calling station ID to MAC addreess for cisco NAS ? Best regards.