4.2. VPN - PPTP, PPPoE and L2TP
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VPN is Virtual Private Network. It means having a number of computer
which are virtually on one network, while on the reality they are on
different networks in the internet.
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Many ADSL and Cable
providers require their users to connect to them using a VPN.
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In order to create a VPN, it is common to tunnel a whole network protocol
stack, down to and including the data link layer, as an application layer
(layer 7) connection.
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Few common implementations of such VPN is PPTP (Point-to-Point
Tunneling Protocol), L2TP (Layer 2 Tunneling Protocol) and
PPPoE (PPP
over Ethernet).
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Out of these, the Linux "back-end"
support for PPTP and PPPoE is good, while L2TP is still under
development.