Citation :
Q 5.6: I'm running Ethereal on Windows; why doesn't my serial port/ADSL modem/ISDN modem/show up in the list of interfaces in the "Interface:" field in the dialog box popped up by "Capture->Start"? A: All of those devices support Internet access using the Point-to-Point (PPP) protocol; WinPcap 3.0 doesn't support PPP interfaces, and WinPcap 2.x doesn't support PPP interfaces on Windows NT/2000/XP/Server, so Ethereal cannot capture packets on those devices with WinPcap 3.0, or with WinPcap 2.x when running on Windows NT/2000/XP/Server. This may cause the interface not to show up on the list of interfaces in the "Capture Options" dialog.
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