i have already add my vpn router to my client.conf file like this : [...] client 10.0.0.0/8 { secret = root shortname = cisco vpn nastype = cisco } [...] the router also is already configured. here it is the configuration : Building configuration... Current configuration : 1809 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname vpn ! boot-start-marker boot-end-marker ! ! memory-size iomem 10 aaa new-model ! ! aaa authentication login default local line aaa authentication login userauthen group radius aaa authentication ppp default group radius aaa authorization console aaa authorization exec default local aaa authorization network VPN-REMOTE-ACCESS local aaa accounting delay-start aaa accounting update periodic 180 aaa accounting network default start-stop group radius aaa session-id common ip subnet-zero ! ! ip cef ! ! ! ! ! ! ! ! ! ! ! ! ! username root password 0 root ! ! ! ! crypto isakmp policy 1 encr 3des authentication pre-share group 2 crypto isakmp keepalive 20 10 ! crypto isakmp client configuration group VPN-REMOTE-ACCESS key test123 dns 192.168.33.240 192.168.33.239 pool REMOTE-POOL ! ! crypto ipsec transform-set VPNTRANSFORM esp-3des esp-sha-hmac no crypto ipsec nat-transparency udp-encaps ! crypto dynamic-map DYNMAP 1 set transform-set VPNTRANSFORM reverse-route ! ! crypto map CLIENTMAP client authentication list userauthen crypto map CLIENTMAP isakmp authorization list VPN-REMOTE-ACCESS crypto map CLIENTMAP client configuration address respond crypto map CLIENTMAP 65535 ipsec-isakmp dynamic DYNMAP ! ! ! ! interface Ethernet0/0 ip address 10.0.0.1 255.255.255.0 full-duplex ! interface Ethernet1/0 ip address 192.168.33.31 255.255.255.0 full-duplex crypto map CLIENTMAP ! ip local pool REMOTE-POOL 10.0.0.10 10.0.0.15 ip http server no ip http secure-server ip classless ! ! ! ! radius-server configure-nas radius-server host 10.0.0.2 auth-port 1812 acct-port 1813 radius-server key root ! ! ! ! ! ! ! line con 0 line aux 0 line vty 0 4 ! ! end i have made a test on my router to request the radius server : routerVPN# test aaa group login password radius new-code and it works correctly ! to make a vpn connection with a client i'm usinf the "UGent Vpn" software. i saw in documentation on the site of cisco that i'm must configure "cisco-av-pair" in the radius server but i don't know and i don't have a graphic mode here it is the cisco web site : http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_examp... thank you very much for your reponses ;-) uness