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hi..
Virtual Private Network (VPN) and a Virtual LAN (VLAN) are two unrelated
terms.
VPN deals with security and connecting nodes in a private network across a
public IP internetwork. Read RFC 1853 - IP Tunneling.
You can take one physical LAN and split it into multiple virtual LANs, or
you can take multiple physical LANs and integrate them into a VLAN. RFC
0824 is good reading.
And also...
The LAN-to-LAN Virtual Private Networks are encrypted connections via Internet that connect geographically distinct networks. These connections are used by companies with offices dispersed territorially and the use of dedicated data communication links would be too expensive.
The host-to-LAN VPNs instead connect individual clients in a encrypted manner to a LAN. This need is ever-increasing alongside the use of firewalls that block the external use of the most sensitive services within company intranet: by using host-to-LAN VPNs an employee who is off site can avail of all relevant intranet services as if physically connected
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