Hello list! I have a 3com Total Control Hub as my NAS which authenticates some users from an NT server running 3com Security Accounting Server. This server proxyies a certain realm called 'foo' to a Linux server running Cistron RADIUS. So normal users who dial in with just their usernames are authenticated by NT, while users@foo are authenticated by Linux/Cistron RADIUS. In order to limit multiple logins for users of the foo realm, the Cistron server needs to have accounting information proxied to it from the NT server. I made sure to put the IP and secret of the Linux server under the 'RADIUS clients' tab of the 3com SAS Database manager program. Also in the 'advanced features' button, i configured the 'RADIUS Proxy and Tunnel Domains' with the realm name, the auth IP and port, and the acct IP and port. do i need a tunnel name? i did all this and ran a sniffer between the NT and the Linux machines. Plenty of traffic on port 1645 (RADIUS Auth) but none on 1646 (RADIUS Acct). Has anyone sucessfully done what i am trying to do? Any suggestions would be welcomed. Thanks list! --g