How to share Internet connection through Ethernet on Windows 10?

Can I use VPN over Ethernet?

This FAQ is about VPN over an Ethernet network with a tunneled IP address and traffic that is terminated on the remote destination (either a server or a client). We can't use this method for tunneling applications because it is fundamentally not secure. See What is TCP/IP protocol? for more information about how VPN's, especially PPTP, work.

Introduction. VPN is a good thing, but the way most people use VPNs is wrong. You should not use VPNs to connect one computer to another on a local network as a solution for security. In fact, the best approach is to use a secure tunnel solution that uses SSL or SSH instead of UDP/IP/UDP as suggested in the FAVPN does have some benefits and uses, such as protecting against attacks on the Internet side of your network (that use UDP or IP). But, if you run a business and are trying to protect sensitive data from unauthorized users, use encrypted tunnels and terminate connections at trusted clients or servers that need to maintain privacy. For example, you could use a VPN with SSL to secure the traffic between your office and an organization or cloud service located in another country and where you wouldn't want to run SSL through your data center.

What protocols are supported? The protocol and configuration that are compatible with IPsec can use any standard protocol including SMTP or IMAP/POP3 or even HTTP or SNMP using TLS. The IPsec configuration includes many options and protocols for choosing the preferred cryptographic algorithms.

What is PPTP? PPTP (point-to-point tunneling protocol) is a proprietary VPN technology from Microsoft developed by David Litchfield and others at Microsoft Research in 1999. It is very similar to SSTP and IPSec. It has never been released as open source, although Microsoft did write open source IPSec and SSTP code, called LibIPSec and LibSSTP. A few years ago, several independent developers started working on implementing PPTP, creating open source implementations based on MS code. Today there are several commercial implementations of PPTP.