Funkwerk VPN Access 250. Data link protocols: Ethernet/Fast Ethernet. Firewall security: Stateful Inspection Firewall, Authentication method: PPP, Security algorithms supported: L2TP, RADIUS, TACACS+. Flash memory: 2 MB, Internal memory: 64 MB. Certification: Support from DOS, Windows 3.x/95/98/NT/ME/2000/XP, UNIX, Macintosh and Novell. Operating temperature range (T-T): 0 - 40 °C, Operating relative humidity range: 20 - 90 %