A layer two forwarding protocol (L2F) provides virtual direct dial-up service into private networks through public internet service providers. An authorized remote client appears as a direct dial-up client to the home gateway, even through the client is accessing the home gateway remotely through the...http://www.google.com.au/patents/US6754712?utm_source=gb-gplus-sharePatent US6754712 - Virtual dial-up protocol for network communication
