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Open Source Network Administration by James Kretchmar

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Chapter 6. Oak

Overview of Oak

Machines that provide network services, and many network devices such as switches and routers, keep a log of messages about operational conditions. This message log is a useful tool for analyzing a problem after it has occurred. When an interface on a router stops functioning, you can login to the router and examine the error log for information about the problem.

There are drawbacks, however, to a system that requires you to login to a device in order to access its system logs. An outage of even a critical device may go unnoticed if it is off-hours and short in duration. But as an administrator, you need to know that it happened and why it happened so that you can prevent it from recurring. It is also difficult to ...

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