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The Book of GNS3 by Jason C. Neumann

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Appendix A. Help! I’ve Fallen and I can’t Get Up

GNS3 is a complex program, and like anything complex, it will occasionally behave in unexpected ways. I’ve already included troubleshooting tips throughout the book, so in this appendix I won’t provide a lot of break-fix information. Instead, I will provide you with basic strategies for solving problems, and I’ll cover a few common problems and possible solutions.

Identifying the Problem

GNS3 problems broadly fall into two categories.

  • Sudden Problems. Problems that occur with a previously working project.

  • Feature Problems. Problems that occur when implementing a new feature.

Sudden problems appear out of nowhere. Your project may have been running fine for weeks, and then all of a sudden it won’t open, ...

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