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L2TP/IPsec
The layer 2 tunnel Protocol is a VPN Protocol that does not offer any encryption. This is why it is usually implemented together with IPsec encryption. Since it is built into modern desktop operating systems and mobile devices, it is quite easy to implement. But it uses UDP port 500 — which means it can't be masked on another port, such as OpenVPN. This makes it much easier to block and harder to bypass firewalls.
In theory, IPsec encryption should be secure. There are some concerns that the NSA might weaken the standard, but no one knows for sure. In any case, it is slower than OpenVPN. The traffic must be converted to L2TP form, and then encryption is added on top of IPsec. This is a two-step process.
Summary: L2TP/IPsec is theoretically secure, but there are some problems. It is easy to configure, but the problem is related to firewalls and is not as effective as OpenVPN. Stick with OpenVPN if possible, but definitely use it via PPTP.
After connecting to the VPN server, all data begins to be transmitted between your PC and the server in encrypted form. Already from the VPN server, all data is transferred to the external resources that you request. Many VPN providers guarantee the complete absence of logs, which means that when issuing information to third parties, they simply will have nothing to give. Also, the level of encryption for many providers is about the same.
A very funny, but very common case. The VPN service provider promises complete anonymity, but at the same time it places a web Analytics system like Google Analytics on its sites and even in the user's account, thereby merging all Google visitors, and therefore the security services. Stay away from such scoundrels.
In order to configure it correctly, you need to understand the principles of vpn 推薦 connection. It is a local network that connects computers connected to a single server rather than to a single router. When connecting, a router is used that issues IP addresses to all PCs in this network. At the same time, it is not so easy to determine your external IP from which you log on to the network. Most blocking services fail to do this. This is due to the fact that traffic packets are transmitted in encrypted form.the keys for getting data are only available on the server where requests are received in the directions you set.
More and more useful interesting and popular sites are getting blocked. The farther the more tangible. The resources checked up by years fall off periodically one after another. For some, we are talking about a couple of applications for others about a couple of dozen, which is already critically inconvenient. Refuse to use them? Can. But not necessarily. For some, work is associated with blocked services in the end.
VPNs are also gaining in popularity as a tool to increase security when connecting to the Internet. Let's say you travel and work on a public Wi-Fi network or live in a country where access to content on the Internet is limited. When you connect to the Internet, your data and computer become available to outsiders who, if desired, can see a list of websites that you visit.
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