![]() You have to configure this in the management interface on the switch. To get around that, managed switches will commonly allow you to set one of the ports as a mirror¹ port which gets all packets heading to or from one of the other ports (called the monitored port).That means we can’t take a capture program, plug it into any port on a switch, and see the traffic for everyone else too. By default, a device plugged into a switch only gets the packets destined for that device (along with multicast and broadcast packets). Switches don’t want to give you all their packets.There are a few things we need to consider: The overall goal of a packet capture tool is usually to listen to all the packets flying by on a network, grab a copy of each of these, and analyze them (or sometimes just save them to disk). While we may occasionally refer to Zeek in our “potential fixes” section, the general concepts and approaches we discuss should apply to any packet capture software running on any platform. In our example we’re running Zeek ( source code ), an open source packet capture and analysis program that runs on Linux and MacOS. In this blog we’ll look at what it is, why it exists, and what you can do to minimize it. Packet loss is a topic that comes up frequently when talking about capturing and analyzing packets from a network. When I run a sniffer on a network, I assume I’m going to see all packets on that network.
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