How GRE Tunnels Work | VPN Tunnels Part 1

Good and simple explanation !!

Overlay network using GRE Tunnel- nicely explained, Thanks

enabling jumbo frames help with GRE and why or why not?

Thank you!

4 Years later I came to watch this AMAZING video and has just 80K views and 160K subscribers, while another guy has channel spends several minutes justto taste spicy and sour food has millions of views in couple days!!
What a stupid people.

Is this still true? I didn't think you could advertise OSPF over GRE as the interfaces would be flapping when trying to send ospf packets to the endpoint?

I have no idea what you're talking about but you're better than a college professor definitely...

Awesome explanation, thanks!

How does lowering mtu avoid fragmentation infact it will increase it so you want highest mtu interface can support

super helpful video, thank you!

Does GRE tunnels work with Virtual Networks also? So two virtual networks could communicate on a SD-WAN via GRE Tunneling?

The way you demonstrated is simply amazing.... Would you mind to share low level stuff on ikev1 &2..... Thanks again.

only problem with this description - is you have a RFC 1911 on the left that will NOT route across the Internet. Would have been nice if the example was more realistic in such a way that it would work in a real world scenario.

Thank you so much!!! Great video!!

good series

Excellent video thank you so much for the breakdown.

perfect

Those virtual interfaces build an ARP cache?
If yes, how do they seem?

i think you missed the static route explanation thats needed here

nice...

man, that's a fantastic video!

Very simple, high level overview of what a GRE tunnel is/does. Well done. Thank you!

Thanks great material

thanks buddy for creating this series. i read a lot but could not get through before , but today atlast i got.

keep making such videos

I am currently learning CCNP Enterprise Encor and found this video series on 'GRE' along with the 'VXLan' and 'VRF' videos very informative with clear explanations. Thank you for posting these videos, will you be posting any others that will be helpful with the CCNP Enterprise course?

Thanks for Very good Explanation , how did you put IP address in tunnel source command ?? it should be interface

Excellent explanation!! I appreciate that 👍🏼

aha so very very simple. Basically it adds what is called "Outer IP" header which has the ISPs routers IPs which are PUBLIC IPs so the routers over the Internet (/WAN) KNOW where they are. And there is also the small gre header that says what the original IP version is being used by the private hosts with private, non-routable IP addresses.

So you stick public IPs on top of the packet and route it as normal. By the time it arrives at the destination and it is de-encapsulated the private host will see it's private ip (non-routable) that it knows. So easy it's a joke haha

Thank you for simplifying gre!

Awesome !!!

I like very much the animated explanation ♥️

Thank you Sir

Best video on GRE ! Surfed over 5-6 videos before landing to this.

Just saw this video after I had a question in CCNA about GRE.
This is amazing. Thank you for putting this together.

Wow very nicely explained

Thanks for creating and sharing with us!! Perfect explanation for us that are new to GRE!!! Cheers!

Awesome video, thanks!

Nicely done!

Thank u man.....

best explained !!!

Great Explanation.. Thanks.

great explanation!

Thanks for this well-explained nuggets :)

very nice explanation - may be a LAB would have been an icing on the cake

Thank you, very clear and easy to understand. Please continue to make videos like this - highly appreciate it.

Finally some quality tutorials, great work!

Thanks. Plz emphasis more on vpn vs gre application, similarity and differences