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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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RACOON-TOOL(8)						      System Manager's Manual						    RACOON-TOOL(8)

NAME
racoon-tool - program to manage the racoon(8) IPSEC IKE daemon. SYNOPSIS
racoon-tool [-h] reload|restart|force-reload|start|stop racoon-tool [-h] sadflush|spdflush|saddump|spddump racoon-tool [-h] vpndown|vdown|vpnup|vup connection-name|all racoon-tool [-h] vpnreload|vreload connection-name|all racoon-tool [-h] vpnlist|vlist [connection-name|all] racoon-tool [-h] vpnmenu|vmenu [connection-name-regexp] racoon-tool [-h] racoonstart|racoonstop|rstart|rstop DESCRIPTION
This manual page documents briefly the racoon-tool command. racoon-tool(8) is a perl script that can be used to control the racoon(8) IKE daemon and the SPD database within the kernel via the setkey(8) command. Various operations that it can do are described below. You can also optionally choose not to use it via reconfiguring the racoon package using dpkg-reconfigure(8). OPTIONS
A summary of options are included below. -h Show summary of options. COMMANDS
start Start racoon(8), loading any needed modules, configuring the SPD, and generating a configuration from /etc/racoon/racoon-tool.conf (head) and following up with *.conf files from /etc/racoon/racoon-tool.conf.d/. stop Stop racoon(8) unloading any crypto/IPSEC modules, flushing the SAD and SPD. reload Regenerate configuration from /etc/racoon/racoon.conf, and /etc/racoon/racoon.conf.d/, HUP racoon(8) and reinitialise the SPD and SAD. restart|force-reload Perform a stop followed by a start sadflush Flush the SAD via setkey(8). spdflush Flush the SPD via setkey(8). saddump|dump Dump the SAD to screen via setkey(8), paginating via your pager. spddump Dump the SPD to screen via setkey(8), paginating via your pager. vpnup|vup connection-name|all Bring up the VPN connection(s). vpndown|vdown connection-name|all Take down the VPN connection(s). vpnreload|vreload connection-name|all Reload the VPN connection(s). vpnlist|vlist [connection-name|all] List the known VPN connections in /etc/racoon/racoon-tool.conf, etc. Can be used by a script or administrator to see if a VPN con- nection exists. vpnmenu|vmenu [connection-name-regexp] Start the VPN menu management mode. This displays the SPD, and you can shutdown VPNs from here. Latter on support will be added for checking status and reloading the chosen connection. racoonstart|rstart Start only the racoon(8) daemon. racoonstop|rstop Stop only the racoon(8) daemon. FILES
/etc/racoon/racoon-tool.conf - configuration file (head). /etc/racoon/racoon-tool.conf.d - configuration file segment directory read after the above. /var/lib/racoon/racoon.conf - generated racoon.conf SEE ALSO
racoon(8), racoon.conf(5), setkey(8), racoon-tool.conf(5). AUTHOR
This manual page was written by Matthew Grant <matthewgrant5@gmail.com>, for the Debian GNU/Linux system (but may be used by others). RACOON-TOOL(8)
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