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VPNs Illustrated: Tunnels, VPNs, and IPsec book

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

VPNs Illustrated: Tunnels, VPNs, and IPsec


VPNs.Illustrated.Tunnels.VPNs.and.IPsec.pdf
ISBN: 032124544X,9780321245441 | 480 pages | 12 Mb


Download VPNs Illustrated: Tunnels, VPNs, and IPsec



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




These tunnels cannot be entered by data that is not properly encrypted. Assuming that reader has a general understanding of what DMVPN is and a solid understanding of IPsec/CEF, we are going to describe the role and function of each component in details. A VPN keeps your wireless communications safe by creating a secure “tunnel,” though which your encrypted data travels. In this post we are going to illustrate two major phases of DMVPN evolution: . 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. The NBMA layer maps to “physical” underlying network while mGRE VPN is the “logical” network (tunnel internal IP addressing). 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. IPSec has been deployed widely to implement Virtual Private Networks (VPNs) (an example of current VPN technology is described in [11]). This process will keep happening as long as the logical tunnel is persistent between the two endpoints. A Layer 3 VPN can use tunneling, encryption, or both. VPN stands for virtual private network. VPNs illustrated : tunnels, VPNs, and IPsec. Not only is data encrypted when The application works well with a wide range of clients including browsers, ICQ, and MSN messenger and comprehensive help illustrates the setup of these clients. By Jon C Snader Type: English : Book Publisher: Harlow : Addison-Wesley, ©2006. ISBN: 032124544X OCLC: 63390377. Tunneling is also known as the encapsulation and transmission of VPN data, or packets. 3) Dynamic IPsec encryption 5) Cisco Express Forwarding (CEF). Traditional ATM and Frame Relay circuits are referred to as Layer 2 VPNs, whereas IPsec tunnels over the Internet are called Layer 3 VPNs. Figure 5 below illustrates the tunnel mode format using the ESP header.

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