Understanding Tunneling for VPNs
"Tunneling is a technology that provides separate communication channels within a network, and both ends can communicate as if they were connected directly" (excerpt from "Network Knowledgeable Textbook")
I think many people explain that
What exactly does this "communication as if it were directly connected" mean?
Wikipedia is
https://ja.wikipedia.org/wiki/ tunneling
private network such as LAN located in multiple remote locations by tunneling is virtually directly connected and communicates as if it were the same network.
It says
Does "communication can be done as if it were the same network" mean that routing using a router is not necessary?First of all, is it possible to use a public network without routing?I don't even know why I need to encapsulate it with an IP header if I don't need routing.
Also,
on this site
https://atmarkit.itmedia.co.jp/ait/articles/0303/21/news004_2.html
By encapsulating PPP frames with IP, PPP connectivity over the Internet, which is an IP network is possible.Consequently, a two-point connection utilizing PPP's ability to negotiate user authentication and protocol/address/compression and error correction methods to be used is realized.
It says.
Do you mean that this is how you can negotiate user authentication and error correction by communicating directly?
Or, by encrypting the data transfer path, the data will not be eavesdropped (almost?), so is it a nuance that it can communicate securely as if it were within the same network without going over the public network?
I asked chatGPT, but there was no clear explanation.
Again, I would like you to tell me exactly what "communication as if it were directly connected" means.
I think that the security with authentication and encryption as you mentioned means that VPNs can achieve the same security as communications between private networks.
If you look at the Wikipedia VPN page , you can see
Administrators and users benefit from functional, security, and administrative policies, as if they were wired between private networks.
It says, and if you read on to it, you'll see
VPNs provide [Note 1] situations in which private networks are connected as if they were wired through encryption and traffic control technologies through the Internet and closed-area networks used by many people
is written, and in Note 1,
No (or few) security concerns when communicating
From the description, it can be interpreted that as if you were directly connected, as if you were communicating with a direct connection.
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