By International Business Machines Corporation
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Extra resources for A comprehensive guide to virtual private networks. Volume II
This sounds like a complicated approach involving a lot of overhead, but several benefits can be derived from this approach which are useful or even invaluable for building VPNs. In fact, the number of Internet VPN scenarios or variations thereof would be quite limited without the use of layer 2 tunneling techniques. 1 Layer 2 Tunneling Protocol (L2TP) The Layer 2 Tunneling Protocol (L2TP) is one of the emerging techniques for providing a remote connection to the corporate intranet. The L2TP protocol has been developed merging two different protocols: the Point-to-Point Tunneling Protocol (PPTP) and Layer 2 Forwarding (L2F).
Non-cryptographic authentication provides some protection against unwanted traffic entering or leaving the network. Common techniques are passwords, packet filtering, and network address translation. However, these can be defeated by a variety of well-known attacks, such as address spoofing, and new attacks are being developed regularly. Each time a new packet filter is designed to thwart a known attack, hackers will devise a new attack, which in turn demands that a new filter rule be generated.
If end-to-end protection is desired, then both the client and server machines need to be IPSec-enabled as well. Through the implementation of this VPN technology, the manufacturer would be able to easily extend the reach of its existing corporate intranet to include one or more parts suppliers (essentially building an extended corporate network) while enjoying the cost-effective benefits of using the Internet as its backbone. And, with the flexibility of open IPSec technology, the ability for this manufacturer to incorporate more external suppliers is limitless.
A comprehensive guide to virtual private networks. Volume II by International Business Machines Corporation