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VPNs Illustrated: Tunnels, VPNs, and IPsec Jon C. Snader
Publisher: Addison-Wesley Professional

ISBN: 032124544X, 9780321245441. A Layer 3 VPN can use tunneling, encryption, or both. When the VPN connection is established between 2 parties (between a VPN client and VPN gateway or between 2 VPN gateways), a secured virtual tunnel will be created with capability to encrypt the data (so no hacker can see the data content ), preserve data integrity (no data change during transmission) and ensure the communication only happen between that 2 authenticated parties. Snader Language: English Page: 480. Tunnel mode is often used to provide connectivity between networks that use private addressing; the outer IP packet's address is routable and allows delivery of the inner IP packet from one private site to another. Traditional ATM and Frame Relay circuits are referred to as Layer 2 VPNs, whereas IPsec tunnels over the Internet are called Layer 3 VPNs. Publisher: Addison-Wesley Professional. The remote access VPN is supported by L2F, PPTP, L2TP and IPsec tunneling protocols. Thanks again for taking the time to illustrate all this. VPNs Illustrated: Tunnels, VPNs, and IPsec Jon C. VPN client: In this post will be a Google Nexus One with Android 2.2.1-2.3.4 using an IPsec PSK tunnel with the l2tp secret not enabled.