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VPN - Virtual Private Networks for small settings.
VPNs are secured private network connections, built on top of publicly-accessible infrastructure, such as the Internet or the public telephone network. VPN typically employ some combination of encryption, digital certificates, strong user authentication and access control to provide security to the traffic they carry. It usually provides connectivity to many machines behind a gateway or firewall.( http://vpn.shmoo.com )
VPN is based on very strong encryption and certificate. It needs a lot of power to perform stable an fast.
VPN is based on a server that is installed on the site to be connected to and a client that is installed on the computer that is going to use for the connection (Windows XP includes natively VPN Client) It is possible to set the server with software (see one of the links below), but if both Server and client are done in software it would work very Slowwww. Most businesses have a VPN appliance that executes the VPN server side in its own hardware. Doing so enable employees to connect to work using VPN fast.
Most Cable/DSL Routers are VPN through I.e. the Router allows the VPN to pass through but does not actually participate in the process. If VPN is really important you should consider buying a Router that is actually a VPN end. I.e. your Router is also a VPN server.
Linksys offers few Entry Level Routers that are End Point VPN.
Sonicwall is very popular as a midlevel VPN Appliance: Sonicwall Products
Connecting to VPN
For casual remote and file transfer there is a way avoid VPN all together by using an encrypted Remote Control and file transfer program.
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