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VPNs, Virtual Private Networks, allow you to establish a secure channel among multiple sites across an insecure public network (such as the Internet, public Frame Relay, or ATM network). Benefits: - allows WAN-over-Internet, cheaper than leased lines, T1, etc. (intranet VPNs)
- "access VPNs" allow telecommuters access, cheaper than dialups, ISDN, etc.
- allow extranet connections with customers, suppliers, resellers, and partners
- provides encryption/authentication
- flexible
- IPsec (2)
- L2F (0)
Layer-2 Forwarding (Cisco)
- L2TP (0)
Layer-2 Tunneling Protocol
| - PPTP (14)
Microsoft's VPN solution built into Windows.
- SOCKS (0)
- ssh (9)
Secure SHell, the most popular program for providing an
authenticated, encrypted shell prompt across the Internet.
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- IP Masquarade-A feature of the Linux kernel, supports IPsec and PPTP.
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