I have learned SharpPcap to capturing packet from a particular network interface. The following code is used to get all network interfaces on local machine:
foreach (PcapDevice dev in CaptureDeviceList.Instance)
Console.WriteLine(dev.ToString());
but when I plug my usp 3G modem and run the above program, the list returned does not contain a line for the usp 3G modem.
How do I apply the packet capture on this 3G modem?
EDIT: I have found one way of doing this. I would love it if someone has something better, because this does require a commercial product. CommView from Tamosoft allows you to capture Verizon Aircard packets. (Can't speak to anything else...)
CommView by Tamosoft
They have a free version which you can use to test with (it only captures every other packet). It's about $250.
Previous Answer
@ Chris Morgan
Unfortunately, modems are seen a PPP connections, which are not supported on Windows XP, Windows Vista, or Windows 7 at the network adapter level. Therefore, winPCap, Wireshark, etc, will not see the traffic.
See Question #5 of the FAQ:
WinpCap FAQ