A comprehensive guide to virtual private networks. Volume by International Business Machines Corporation PDF

By International Business Machines Corporation

ISBN-10: 0738414956

ISBN-13: 9780738414959

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Extra info for A comprehensive guide to virtual private networks. Volume III, Cross-platform key and policy management

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Again what about the cost factor? As you can see, making all those decisions is not easy and takes time and there is no guarantee that you will do everything right. This redbook helps you during several of the steps mentioned above. It describes VPN scenarios, technologies and products and it illustrates how you can use those products to implement VPNs. 1 Branch Office Interconnections The branch office scenario securely connects two trusted intranets within your organization. Your security focus is on both protecting your company′s intranet against external intruders and securing your company′s data while it flows over the public Internet.

The L2TP protocol has been developed merging two different protocols: the Point-to-Point Tunneling Protocol (PPTP) and Layer 2 Forwarding (L2F). The remote dial-in user scenario is the most common situation for using L2TP. Remote users do not need to make a long-distance call or use a toll-free number to connect directly to the corporate servers but cost constraints suggest the use of ISPs’ points of presence (POPs) as a more cost-effective solution. In this case the dial-in user connects to the nearest POP provided by the ISP and then the session is routed through the ISPs and/or the Internet cloud to reach the corporate LAN access.

For example, you are at home or on the road but need a confidential file on a server within your intranet. By obtaining Internet access in the form of a dial-in connection to an ISP, you can communicate with the server in your intranet and access the required file. One way to implement this scenario is to use a remote access tunneling protocol such as L2TP, PPTP or L2F. Another way is to use an IPSec-enabled remote client and a firewall, as shown in Figure 7 on page 48. Ideally, you may wish to combine both solutions which will provide the best protection and the most cost-effective way of remote access.

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A comprehensive guide to virtual private networks. Volume III, Cross-platform key and policy management by International Business Machines Corporation


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