This shared aspect also makes Hubs a security risk, so replace that old hub with a switch if you still have one in production.įor troubleshooting, the Hub comes in handy. Subsequently, all packets sent and received on that hub can be monitored from any port on that hub. Hubs are shared network devices that operate at the physical layer, or layer 1 of the OSI Network Model, with all devices using the same bandwidth and media. A hub, such as the simple 4 port Netgear model shown in Figure 1, looks and seems very similar to a Switch. One simple tool that is useful to monitor another device’s packet flow is a hub. Simply connecting a laptop running Wireshark to the same switch or switch embedded into a router as the target device will not allow a PC to monitor the packet flows of another device without some additional tools, features, or options. To be able to capture those packets, the packet capture tool has to be sharing the network segment being used by the specific device. This time, I’m going to go a bit deeper into the how to for doing packet captures.Ī common use for packet capture is to monitor the packets going to and from a specific device. In my previous post, I talked a little bit about how to use Wireshark and walked through some steps to run a simple packet capture from a PC. Using packet papture software like Wireshark is a useful troubleshooting technique that can be used to examine packets and gather details to help find the root of a problem.
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