VPNs Illustrated: Tunnels, VPNs, and IPsec by Jon C. Snader

VPNs Illustrated: Tunnels, VPNs, and IPsec



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VPNs Illustrated: Tunnels, VPNs, and IPsec Jon C. Snader ebook
Format: chm
Publisher: Addison-Wesley Professional
ISBN: 032124544X, 9780321245441
Page: 480


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. IPSec has been deployed widely to implement Virtual Private Networks (VPNs) (an example of current VPN technology is described in [11]). Virtual private networks (VPNs) based on the Internet instead of the traditional leased lines offer organizations of all sizes the promise of a low-cost, secure electronic network. Thanks again for taking the time to illustrate all this. The remote access VPN is supported by L2F, PPTP, L2TP and IPsec tunneling protocols. This type of profile is tied to the interface (similar to what we did for a crypto-map) by means of the tunnel protection ipsec profile command. A VPN is for wrapping raw IP packets into some kind of "tunnel" between two sites (one of the site being possibly reduced to one computer, i.e. 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. This sample configuration is also useful to illustrate the overall structure of a FLEX VPN policy. Figure 5 below illustrates the tunnel mode format using the ESP header. Having discussed the motivations behind FLEX VPN (http://wp.me/p1loe7-fJ) and presented information about positioning of Cisco IOS VPN solutions (http://wp.me/p1loe7-gy), it's now time to jump to some practical scenarios.