Re: capturing by Stick modem

[Guy Harris <guy () alum mit edu>]

On Jan 5, 2010, at 1:36 PM, Stephen Fisher wrote:

> Assuming that you're using Windows, this means that the WinPcap (http://www.winpcap.org 
> ) capture library doesn't recognize that card.

Or that WAN cards - such as mobile phone network cards (he said "Huawei HSDPA USB key (modem device)" in his other 
message) - show up on Windows only as

        1) the "GenericDialupAdapter" before you've established a PPP connection

or

        2) that adapter or a "WAN (PPP/SLIP) Interface" for the PPP connection once the connection has been established.

See

        http://www.winpcap.org/misc/faq.htm#Q-5

and

        http://wiki.wireshark.org/CaptureSetup/PPP

If it's not Windows, similar issues may exist - what libpcap/WinPcap, and thus tcpdump/WinDump/Wireshark/etc. capture 
on, are what one might call "network interfaces", which are software constructs that don't necessarily directly map to 
physical network adapters.  For example, in many UN*Xes, a PPP connection will show up as an network interface with a 
name such as "ppp0", regardless of whether it's running on a serial line, a mobile phone connection, PPPoE over {ADSL, 
cable modem, etc.), a VPN link, ....
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