Chapter 21. Troubleshooting IPv4 Routing

This chapter examines how to troubleshoot the IPv4 data plane. These topics form the foundation of how IP works: a host’s logic and how that logic is impacted by its IPv4 settings, how those settings must match with the default router, how routers forward packets, and how the IP addressing plan can cause problems.

Note that the ICND1 book discusses these topics in depth—in fact, this very chapter exists in the ICND1 book as Chapter 24, “Troubleshooting IPv4 Routing.” This chapter in the ICND2 book is identical in that all the words, figures, examples, and tables are the same; the items may appear in slightly different places on the page due to how the publishing process lays out the items on the pages. ...

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