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URL:
http://www.ietf.org/html.charters/l2vpn-charter.html
Microsoft, 3Com®, and several other companies have
developed the Point-to-Point Tunneling Protocol (PPTP) and Microsoft has
extended Windows NT to support it. PPTP and Layer 2 Tunneling Protocol,
proposed by Cisco Systems®, are among the most likely proposals as the basis
for a new Internet Engineering Task Force(IETF)
standard. Generally, there are three computers involved in every PPTP
deployment:
·
·PPTP client
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Network access server
·
PPTP server
A typical deployment of PPTP starts with a remote or
mobile PPTP client that needs access to a private enterprise LAN by using a
local Internet Service Provider (ISP). The client connects to a network access
server (NAS) at the ISP facility using PPP connection. Network access servers
are also referred to as front-end processors (FEPs), dial-in servers, or
point-of-presence (POP) servers. Once connected, the client can send and receive
packets over the Internet or any other network using the TCP/IP protocol.
Virtual Private LAN Service (VPLS)
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