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What is a vpn tunnel.
What is tunnel mode in vpn. With site to site vpns the thing is that hosts on separate vpn connected networks are the session endpoints and ipsec peers are just tunneling the protected traffic between the peers on the way from one host to another. Ipsec can be used to create vpn tunnels to end to end ip traffic also called as ipsec transport mode or site to site ipsec tunnels between two vpn gateways also known as ipsec tunnel mode. To help explain these modes and their applications we will provide a few examples in the following articles.
Ipsec can actually operate in two different modes. Tunnel mode is used to encrypt traffic between secure ipsec gateways for example two cisco routers connected over the internet via ipsec vpn. In ipsec tunnel mode the original ip packet ip header and the data payload is encapsulated within another packet.
The original packet is encapsulated by a another set of ip headers. Configuration and setup of this topology is extensively covered in our site to site ipsec vpn article. In ipsec tunnel mode the original ip datagram from is encapsulated with an ah provides no confidentiality by encryption or esp provides encryption header and an.
Deciding which ipsec mode to use depends dramatically on your network topology and the purpose of your vpn. A vpn tunnel short for virtual private network tunnel can provide a way to cloak some of your online activity. For example tunnel mode is used with vpn where hosts on one protected network send packets to hosts on a second protected network via our pair of ipsec peers.
Tunneling creates a secure enclosed connection between two devices by using the same old internet. Ipsec vpn works in this mode as it creates the vpn tunnel. Therefore the connection is much more secure and private.
When you re making a site to site or site to remote user vpn connection then this is where you are creating a tunnel or a secure tunnel from one gateway to another. Now let s try to put it all together. Tunneling is the process by which vpn packets reach their intended destination which is typically a private network.
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