Virtual Private Network (4)
Requirements for VPN:
- end-to-end Quality of Service (QoS) but not available yet.
- competing standards include: RSVP, IPv6, ATM QoS, MPOA
- security; reliability; good performance; internet access
Secure tunneling over public PDN:
- PPTP - Microsoft (In Win NT)
- L2F - Cisco (Layer 2 forwarding)
- ATMP - Ascend (Ascend Tunnel Management Protocol)
- L2TP - Microsoft / Cisco (Layer 2 Tunneling Protocol)
- IPSec - Internet Protocol Security
Security is based on encryption and authentication
- Client side x.509 certificates,
- SecurID; SmartCard, CryptoCard,
- S/Key authentication module