mirror of https://github.com/tLDP/LDP
65 lines
1.9 KiB
XML
65 lines
1.9 KiB
XML
<!-- $Id$ -->
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<chapter id="ch-trouble">
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<title>Troubleshooting</title>
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<para>
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Invariably, troubles and misconfigurations creep into networks. New
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devices get connected and added to a network. Old devices are removed,
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and something seemingly unrelated breaks. Troubleshooting is really a
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test in discerning patterns.
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</para>
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<para>
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My favored method for solving problems is to start with the simplest
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elements, verifying correct operation and proceeding to the next layer or
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element until I have isolated the problem element. If you are lucky,
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you'll know from a symptom where the problem is likely to be, but more
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often, you'll have to start at the bottom of the networking hierarchy, and
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verify each other layer.
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</para>
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<section id="trouble-intro">
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<title>Introduction to Troubleshooting</title>
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<para>
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The first thing to consider whenever somebody reports a strange
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networking problem is any recent change. What has changed recently in
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the network? Have any new machines been added? Is the user using a
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service which was recently decommissioned? Did a machine (firewall,
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mail server, DNS resolver) recently reboot? Did all of the services
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restart?
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</para>
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<para>
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</para>
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<para>
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</para>
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<para>
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</para>
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<para>
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</para>
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</section>
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<section id="trouble-ethernet">
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<title>Troubleshooting at the Ethernet Layer</title>
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<para>
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</para>
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</section>
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<section id="trouble-ip">
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<title>Troubleshooting at the IP Layer</title>
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<para>
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</para>
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</section>
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<section id="trouble-routing">
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<title>Handling and Diagnosing Routing Problems</title>
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<para>
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</para>
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</section>
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<section id="trouble-tcp">
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<title>Identifying Problems with TCP Sessions</title>
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<para>
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</para>
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</section>
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<section id="trouble-dns">
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<title>DNS Troubleshooting</title>
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<para>
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</para>
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</section>
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</chapter>
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