December 2013
Intermediate to advanced
452 pages
9h 45m
English
Content preview from Network Analysis using Wireshark CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Analysing DNS problems
In the previous recipe, we saw how to identify a normal operation of DNS. In this recipe, we will learn how to discover problematic behavior of DNS, and how to figure out its source.
Getting ready
A DNS problem can result in bad performance while browsing the Internet, slow network while working inside the organization network, or any other performance issues. We will see how to isolate these problems and how to find out whether it is a DNS issue or not.
How to do it...
There are two major types of problems in DNS:
- DNS cannot resolve a name
- Slow operation of DNS
In both cases, connect your Wireshark to the network in the following order when you suspect an Internet connectivity problem:
- First, port mirror the PC of the customer ...
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