"ppp0", "ppp1", etc.: PPP interfaces, see CaptureSetup/PPP "lo0": virtual loopback interface, see CaptureSetup/Loopback
On most systems you can get a list of interfaces by running "ifconfig" or "ifconfig -a". Wireless interfaces can usually be detected with names containing: "Wireless", "WLAN", "Wi-Fi" or "802.11", see CaptureSetup/WLAN for capturing details. "Generic NdisWan adapter": old name of "Generic dialup adapter", please update Wireshark/WinPcap! "Generic dialup adapter": this the name of the dialup interface (usually a telephone modem), see CaptureSetup/PPP WinPcap provides some special interface names: The interfaces names are provided by the network card manufacturer, which can be helpful to identify an interface. There are some common interface names which are depending on the platform.