By International Business Machines Corporation
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Extra resources for A comprehensive guide to virtual private networks. Volume III, Cross-platform key and policy management
Thus, a user’s data could be delivered via a false tunnel to a malicious impostor gateway where it could be examined or even altered. ISP Access Box Correct Tunnel Security Gateway False Tunnel Impostor Gateway Figure 3. Exposures in the external (Internet) segment There are also dangers as the datagram travels within the tunnel. As illustrated in Figure 3, user datagrams pass through routers in the Internet as they travel along a path toward the tunnel endpoint. If the datagrams are in cleartext, any of these routers could easily examine or modify the datagram, and passive attackers could eavesdrop on any of the links along the path.
2 Performance considerations Next to security, performance is among the most critical requirements for virtual private networks. Again the problem lies in the task of finding a way to map a service guarantee from a private network to a virtual connection running over a public network. 1 Quality of Service (QoS) In a virtual private network, just as in a conventional network, there will be a desire to provide distinct transport characteristics (quality of service) for packets as they travel from source to destination.
Are security features such as authentication and encryption provided by applications or is the network expected to take care of that? This leads to a choice between specific or generic security technologies. What are the required levels of protection? fm Draft Document for Review October 15, 1999 12:00 pm What is the projected growth of the VPN topology to be deployed? Scalability is often an important criterion for a network. With a VPN this includes issues such as the following: • • • • • Dynamic (IKE) versus manual tunnels Pre-shared keys versus certificates Public key infrastructure (PKI) Geographical span Cost of implementation, migration and ownership What is the VPN infrastructure going to look like and who will support it?
A comprehensive guide to virtual private networks. Volume III, Cross-platform key and policy management by International Business Machines Corporation