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Practical Packet Analysis, 2nd Edition by Chris Sanders

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Real-World Problems

We’ll now shift to some examples of problematic traffic. Let’s look at various Internet access problems, as well as typical problems like an unreliable printer and a connectivity issue from a branch office.

No Internet Access: Configuration Problems

The first problem scenario is rather simple: A user cannot access the Internet. We have verified that the user can access all of the internal resources of the network, including shares on other workstations and applications hosted on local servers.

The network architecture is fairly straightforward, as all clients and servers connect to a series of simple switches. Internet access is handled through a single router serving as the default gateway, and IP addressing information is provided ...

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