VPNs, Proxies and Secure Tunnels Explained (Deepdive)

What is a secure "tunnel"? When I started to learn about computers the name confused me. I couldn't imagine how it works on a technical level. In this video we build upon knowledge from the previous videos, to develop an intuition for what a tunnel, VPN or proxy is.

Chapters:
00:00 - Intro and Background
00:53 - Networking as a Blackbox
06:58 - The VPN Blackbox
08:10 - VPNs Forward Entire Packets
10:01 - Virtual Network Cards with TUN/TAP
12:34 - Outro

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[janaakhterov]

I'd really enjoy a Deepdive about TLS.

[jayfraxtea]

Great video! The most important part is your smiling face at 6:57 when you talk about the "beautiful way". The next time I'm struggling with incompatible IPSec-tunnels, I'll remember your face and all frustration will be gone.
You oversimplified a bit: not all tunnels have their own interface. We all love good old SSH tunnelling, as we do with recent websocket tunnels.

[goobertnelius]

I was just wondering about this and then got a notification.

[ajko]

As a network engineer, tunnels are by far the most deceptive concepts. At their simplest, you're just shoving IP within IP, at their most complex, you get complaints ;).

[anonymousperson]

Great video content for those, who start learning networking. Even basic understanding how routing works will surely make VPNs much easier to grasp. Especially those, which use virtual interfaces. On the other hand, policy-based ipsec tunnels, which do not have nor their own routes, nor endpoint IPs, yet can somehow connect private networks just as fine as those tun/tap devices always amazed me. While I certainly can configure & use that, I never could understand how it works on a packet level, would be a nice if you could do some explanation video, thanks!

[QueRedFire]

Great video! From a perspective of a graduated cyberdefence student and actual penetration tester, these questions "from the past" are 100% in point! Other thing that bothered me in the past is for example "How the email systems actually works?"

[ArthurSchoppenweghauer]

I would appreciate a video about OAuth & JWT, generally these authentication methods and how these tokens are created, sent and stored via HTTP and how they relate to user roles and permissions I find difficult to understand.

[sanjeevKumar-eghp]

Thank you so much for sharing the knowledge in such a simple manner

[codewizard]

Using swIPE protocol I was part of a small team that implemented one of the first VPN tunnels over the internet with the tunnel running between two proxy based firewalls. I also implemented a DOS/Windows vpn client. This was around 1996. Later ipsec and TLS became available. Things have really changed now that encrypted comms is the norm : )

[alastairtheduke]

This is such a good explanation. You are so good at explaining these topics and such a natural in front of the camera

[DarkMonsterGFX]

Amazing video! It would be awesome to do a second version, but diving deeper and complex! Again, thanks for your videos, they are very informative and easy to follow

[VegaSlayer]

I feel lucky that you still share the knowledge with us. literally gold channel

[tylerb]

I would absolutely KILL for a video discussing how Kerberos works. Or, if possible, every step that happens from plugging a smart card into a windows machine during Interactive Sign On to Kerb to successfully getting into you computer.

[ThePowerRanger]

Wow, this was complex but you explained it really well. Also thnx for including the python code.

[FreestyleTraceur]

I'd love a deepdive on WireGuard protocol and how things like Tailscale work under the hood to get around CGNAT. Thanks for the awesome videos!

[kevint.]

Can it be a coincidence that a server on the IP you used in your video now hosts an nginx instance with some weird XSS-like payload in its TLS-certificate common name? ('"'><svg/onload=alert(1)>')

[alishabani]

If you mix these concepts with SSL that would be very interesting at least for me. Thank you for sharing knowledge

[xddf]

Wow, the networking world is amazing, thank you

[Ramsas]

Talk about certificates, I'm using them, issuing them but don't *really* understand it. CA Authority, TLS, SSL.

[randlekonoble]

Really detailed video, I’ve been experimenting with tunnels recently & I think you explained the underlying concepts extremely well 🥳🥳.