Not Linux nor no-cost, but For $999 there's the Mac Mini w/ Leopard Server option: http://store.apple.com/us/configure/MC408LL/A?mco=MTMzNzU5Nzc Out of the box LDAP, Kerberos, RADIUS. Two-factor auth should be possible but I haven't looked into it myself. -- Andrew S. Zbikowski | http://andy.zibnet.us IT Outhouse Blog Thing | http://www.itouthouse.com