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Summary
A VPN is a useful tool for extending the
reach of a local network. You can use this tool to give individual remote
users, or entire remote networks, access to nonpublic servers on your local
network. This is an extremely useful tool when you want to support
telecommuting or when you want to tie together two or more networks at distant
locations, in order to share servers or otherwise integrate those networks. Several
VPN products exist, and many of these are available for Linux. Two particularly
popular protocols are PPTP, which is implemented in Linux by PoPToP and
PPTP-Linux, and FreeS/WAN. PPTP is commonly used by individual remote clients
to link to a central network, while FreeS/WAN is more commonly used to tie
together entire networks. Both can be used in either way, though. Before you
implement a VPN, you should carefully consider the security implications of
doing so, paying particular attention to the fact that each VPN client is
another potential entry point to your local network.
