Determining where to capture

In this section, we'll take a look at determining where best to start a packet capture for the troubleshooting scenario. Now, in this troubleshooting scenario, we have a user that is reporting that they're unable to access the FTP server. They start with their client, and it just says that the connection does not work.

Now, what we need to do is determine where we need to begin packet captures in order to figure out what's going on:

There might be an issue on the client side; there might be an issue on the server side; or there might be an issue somewhere in between on the internet, possibly. Maybe it's a routing issue, or something like that that's out of our control. So besides taking a look at log files on the client or the server, we'll take a look at the packet captures themselves. Additionally, there might be a problem somewhere between the client and the internet, or between the internet and the server. These intermediary devices could be firewalls or routers...