Network Sniffing ISDN and WLAN

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I would like to show to my manager that VPN is useful. My idea was to connect with our standard laptop (win2000 + pcmcia diva isdn card) to the internet, go to google and enter a search entry. I would like to log all of this traffic on the laptop and show him that I can see the word entered in google. Then I would do the same thing with VPN on and the traffic encrypted.
Unfortunately windump seems only to work on my ethernet card.
Since I want to do this scenario first with my ISDN card connected and then with a WLAN card connected to a hotspot in our airport I am searching for a sniffing tool for these cards that does the same as tcpdump/windump/ethereal for ethernet cards. Or is it possible to configure these tools (do I need an additional WinPcap or some other driver?)

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