Tài liệu Virtual Private Networking in Windown 2000: An overview

Introduction . 1
Common Uses of VPNs . 2
Remote Access Over the Internet 2
Connecting Networks Over the Internet 3
Connecting Computers over an Intranet 3
Basic VPN Requirements 4
TUNNELING Basics . 6
Tunneling Protocols . 7
How Tunneling Works 7
Tunneling Protocols and the Basic Tunneling Requirements 8
Point-to-Point Protocol (PPP) . 9
Phase 1: PPP Link Establishment 9
Phase 2: User Authentication 9
Phase 3: PPP Callback Control 11
Phase 4: Invoking Network Layer Protocol(s) 11
Data-Transfer Phase 11
Point-to-Point Tunneling Protocol (PPTP) . 12
Layer Two Tunneling Protocol (L2TP) . 12
PPTP Compared to L2TP/IPSec 13
Advantages of L2TP/IPSec over PPTP 13
Advantages of PPTP over L2TP/IPSec 14
Internet Protocol Security (IPSec) Tunnel Mode 14
Tunnel Types 15
Voluntary Tunneling 15
Compulsory Tunneling 16
Advanced SECURITY Features . 17
Symmetric vs. Asymmetric Encryption (Private Key vs. Public Key) . 17
Certificates . 17
Extensible Authentication Protocol (EAP) 18
Transport Level Security (EAP-TLS) 18
IP Security (IPSec) 18
Negotiated Security Association 19
Authentication Header 19
Encapsulating Security Payload 19
User Administration 20
Support in Windows 2000 . 20
Scalability . 20
RADIUS 20
Accounting, Auditing, and Alarming 22
Conclusion 23
For More Information 23