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

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Her areas of expertise include network analysis, design, SI, troubleshooting. Alexander Schmid is a Senior Consultant for Information and Technology Management with IBM Unternehmensberatung GmbH (IBM UBG) in Germany. fm Global Network. He has 10 years of experience in the networking environment including network operations, systems programming, design, architecture and consulting. He holds a degree in computer sciences from the university of Erlangen, Germany. During his studies he worked in the IBM Zurich Research Lab for several months.

Fm Draft Document for Review October 15, 1999 12:00 pm • Permit IP protocols 50 and 51 for ESP and AH • Permit UDP port 1701 for L2TP and L2F • Permit IP protocol 47 (GRE) and TCP port 1723 for PPTP Note The firewall or router filter rules need to support filtering of the relatively new VPN protocols to be effective. 7 Exposures in an intranet Although there is a popular belief that most security threats will occur in the public Internet, there have been studies showing that many of the attacks actually arise internally.

Based on the work of the Internet Engineering Task Force (IETF) IBM chose to use IPSec for its VPN solutions. In addition to IPSec, technologies such as layer 2 tunneling and remote access authentication servers provide the necessary flexibility to apply adequate security to any given VPN scenario. 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.

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