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Full Discussion: Help me understand VPN
Top Forums UNIX for Beginners Questions & Answers Help me understand VPN Post 303045432 by stomp on Friday 20th of March 2020 12:18:46 PM
Old 03-20-2020
VPN stands for virtual private network. The virtual means that this privacy is accomplished allthough it is by nature not private at all when you communicate over a public network - the internet. The data flows through all kinds of networks. All of them being owned and operated by someone else than you or your company, so from a privacy point of view: Those networks can not be trusted. So the virtual privacy is being achieved by strong encryption. This creates the methaphor that is a private network because only allowed people are connected or configured to enter the encrypted space.

There are lots of software packages and some different protocols that are used to operate VPNs.

The count of software packages are plenty. The protocols are relatively few, like:
  • IPSec
  • OpenVPN
  • wiregard
  • Closed source vendor specific implementations, created completely on their own or based on one of the above

The different properties of a vpn solution are:
  • Manageability(Tools to manage Access and Accounts and Distribution)
  • Compatibility with protocols(as shown above)
  • Closed Source/Open Source
  • Commercial products usally introduce their own hardware product series to be used with the VPN software
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LEARN ABOUT ULTRIX

systemd-networkd.service

SYSTEMD-NETWORKD.SERVICE(8)				     systemd-networkd.service				       SYSTEMD-NETWORKD.SERVICE(8)

NAME

       systemd-networkd.service, systemd-networkd - Network manager

SYNOPSIS

       systemd-networkd.service

       /lib/systemd/systemd-networkd

DESCRIPTION

       systemd-networkd is a system service that manages networks. It detects and configures network devices as they appear, as well as creating
       virtual network devices.

       To configure low-level link settings independently of networks, see systemd.link(5).

       systemd-networkd will create network devices based on the configuration in systemd.netdev(5) files, respecting the [Match] sections in
       those files.

       systemd-networkd will manage network addresses and routes for any link for which it finds a .network file with an appropriate [Match]
       section, see systemd.network(5). For those links, it will flush existing network addresses and routes when bringing up the device. Any
       links not matched by one of the .network files will be ignored. It is also possible to explicitly tell systemd-networkd to ignore a link by
       using Unmanaged=yes option, see systemd.network(5).

       When systemd-networkd exits, it generally leaves existing network devices and configuration intact. This makes it possible to transition
       from the initrams and to restart the service without breaking connectivity. This also means that when configuration is updated and
       systemd-networkd is restarted, netdev interfaces for which configuration was removed will not be dropped, and may need to be cleaned up
       manually.

CONFIGURATION FILES

       The configuration files are read from the files located in the system network directory /lib/systemd/network, the volatile runtime network
       directory /run/systemd/network and the local administration network directory /etc/systemd/network.

       Networks are configured in .network files, see systemd.network(5), and virtual network devices are configured in .netdev files, see
       systemd.netdev(5).

SEE ALSO

       systemd(1), systemd.link(5), systemd.network(5), systemd.netdev(5), systemd-networkd-wait-online.service(8)

systemd 237													       SYSTEMD-NETWORKD.SERVICE(8)
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