2

Probably the most popular related project with GUI is Wireshark Wireshark is the world’s foremost and widely-used network protocol analyzer. It lets you see what’s happening on your network at a microscopic level and is the de facto (and often de jure) standard across many commercial and non-profit enterprises, government agencies, and educational ...


2

You have to configure the RasPi as a simple router. With tethering you should always get an ethernet interface. For example with USB-Tethering you get the interface usb0 out of the box with Raspbian. You can use this interface like any other network interface. I use systemd-networkd to configure networking because it makes things easier. Just follow to Use ...


1

You can use tcpdump too. It may already be installed on your distro. It depends on how far you want to go into the analysis of captured packets.


Only top voted, non community-wiki answers of a minimum length are eligible