By International Business Machines Corporation
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Additional resources for A comprehensive guide to virtual private networks. Volume III, Cross-platform key and policy management
That way you can collect and evaluate logging information in a central location which makes intrusion detection and trend determination much easier. 4 Conclusions Some performance issues, such as encryption, are easier to tackle than others, such as quality of service. Standards are maturing toward providing the latter across public networks, but at the moment you are left to try a VPN to find out if your application requirements can be met, either in full or partial, or not at all. Encryption overhead can be easily absorbed by modern hardware encryption and dedicated VPN devices up to multiple T1 speeds, which should be adequate for most VPN scenarios.
With this approach, any confidential information would be hidden from untrusted Internet users, with the firewall denying access to potential attackers. With the establishment of branch office connection VPNs, the company′s corporate headquarters will be able to communicate securely and cost effectively to its branches, whether located locally or far away. Through VPN technology, each branch can also extend the reach of its existing intranet to incorporate the other branch intranets, building an extended, enterprise-wide corporate network.
Since IP is a connectionless technology, each user datagram could potentially follow a different path. And in fact, traffic from several different companies could all flow simultaneously through a given backbone router in the Internet. For example, a datagram that originated in company A’s intranet and a datagram that originated in company B’s intranet could both flow through a common router located somewhere in the Internet. A company’s traffic on the Internet can no longer be considered to be isolated from the outside world, as it would have been on a dedicated private network, since flows from different VPNs will be intermixed on the Internet backbone.
A comprehensive guide to virtual private networks. Volume III, Cross-platform key and policy management by International Business Machines Corporation