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I'm Kumar and I'll assist you today. Yes, its very much possible and there is readily available material in the Internet.
You may use Wireshark for the same. I attached a link below to help understand how it works.
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I see. For VPN, there is a good link available online which shares us information on Tunneling. You may have a look.
Hi My name is ***** ***** have been going through the notes. May ask what you are trying to solve for? If you are going to "sniff" the traffic, you won't be able to have an address on your nic. You need to be in promiscuous mode. Plus - looking at someone else's wireless network without permission is not the best idea. You could also try aircrack-ng. IF the information is going through a VPN, you won't be able to see the traffic. The only way to get the VPN tunnel is to do a "man in the middle".
It is not easy to break into a VPN. If you are using SSL, that is a different story. THe bad guy can redirect SSL traffic and do a "man in the middle". But for someone to do that, the bad guy is pretty serious. If you use an IPSEC VPN, you will be fine. IPSEC is your friend. There are services that provide connectivity. https://www.pcmag.com/roundup/285788/the-best-free-vpn-services
I hope that helps..