Hi freeradiusers, In purpose to implementing eap-sim supplicant i created the following virtual infrastructure : supplicant -------------------------- NAS (Access Point) --------------------------------------------- freeradius server 10.0.0.1 Ethernet 10.0.0.2 UDP 195.12.16.17 supplicant :: is my real computer NAS:: is a vmplayer virtual machien and freeradius server: is lxc container (virtual machine too) i have to test communications between supplicant <-> NAS and then between NAS <-> server thanks to eapol_test i can know test udp communications between NAS and server (thank you matthew your answer was very apreciated) and know i have to test (simulate, understand )802.1x eap communication between supplicant and nas, i can't find a way to simulate a NAS (Point ACCESS) with 802.1x supplicant thant can controle ethernet and not wireless access from supplicant, because i use linux bridge to connect my virtuel machines to each others (so no wireless or can we simulate wireless connexion too ?) clarification on this point will be very appreciated ! Thanks in advance