Chapter 22. Remote Access VPN Troubleshooting ScenariosThis chapter provides real-world scenarios faced by Cisco's internal remote access (RA) group in supporting their Virtual Private Network (VPN) infrastructure. Each scenario is followed by several possible problems or cases, and each case includes one or more solutions. The chosen cases were derived from over 4000 cases solved by the group. Cisco proudly declares that they implement all their own products in their own network. The solutions provided might not be the only ones for that particular problem; however, they are thoroughly tested and are proven to be the most successful. The scenarios are based on the Cisco VPN 3000 client version 3.0 (also called the Unity client) for Microsoft Windows. Versions of the VPN client 3.5- suport only Windows operating systems. Versions 3.5+ support operating systems other than Windows, including MAC OSX and Solaris 2.6. Also, the VPN client for Linux supports Red Hat version 6.2 Linux (Intel), or compatible libraries with glibc Version 2.1.1-6 or later, using kernel versions 2.2.12 or later. This chapter primarily focuses on the following common troubleshooting scenarios:
These scenarios assist VPN users and VPN network administrators to solve current issues. In some of the following scenarios, the perspective from the user and the core environment are documented to show the troubleshooting steps that a network administrator and a user should take to solve a particular problem. Table 22-1 is a quick reference to help you get started.
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