1. The term VPN stands for Virtual private network.
2. Like a DMZ a VPN is a security concept, it is not a protocol (like SSH) or a certain software package
3. There are multiple software packages available to set up a VPN between two or more hosts
4. they all use the Server <-> Client concept and usually are incompatible with one another!

	If your hardware has some sort of Cryptographic Hardware Acceleration you should make sure it is supported by your OS (OpenWrt) and enabled.
	Migration and merger wanted: We already have a couple of articles about VPN on OpenWrt: http://wiki.openwrt.org/?do=search&id=vpn you can start from scratch or migrate them

→Internet Protocol Security, Openswan, strongSwan, configure strongSwan with UCI

• vpn.ipsec.basics Some basics, considerations and prerequisites for IPsec VPN
• vpn.ipsec.firewall Firewall and zones in IPsec VPN
• vpn.ipsec.site2site Setup a site to site IPsec VPN
• vpn.ipsec.certificates IPsec VPN with certificates
• vpn.ipsec.overlappingsubnets IPsec VPN with overlapping subnets
• vpn.ipsec.roadwarrior OpenWrt as IPsec gateway for road warriors
• vpn.ipsec.roadwarriorcertificates Road warrior setup with certificates

• Openswan (oldwiki)

→OpenVPN, bridged vs. routed

Articles we have:

• vpn.openvpn (recommended) & vpn.howto

Articles we want instead:

• vpn.server.openvpn.tun describes a TUN-based (routed tunnel, Layer3) solution
• vpn.server.openvpn.tap describes a TAP-based (bridged tunnel, Layer2) solution
• vpn.client.openvpn.tun Howto install and setup an OpenVPN Client on OpenWrt with Luci
• vpn.client.openvpn.tap Howto install and setup an OpenVPN Client on OpenWrt and share the VPN connection transparently with the router clients

Once you set up a VPN server on your OpenWrt router, you (and the other participants) will need to each install and configure a VPN client (compatible with the VPN server) on each of your host machines. For HowTos regarding that, you should visit the Wiki/Forum of your OS!

• vpn.server.pptpd describes a Point-to-Point Tunneling Protocol (PPTP) solution with pptpd
• vpn.client.pptp Howto install and setup a VPN client compatible with PPTP servers
  • vpn.nat.pptp VPN NAT traversal (VPN Pass Through) for single/multiple LAN client(s) connecting to PPTP Servers on the WAN

• vpn.client.vpnc vpnc = A VPN client compatible with Cisco's EasyVPN equipment
  • vpn.client.vpnc (oldwiki)
• vpn.l2tp or connect_by_l2tp, see Layer 2 Tunneling Protocol and Template:VPN
• pseudowire

• http://www.tinc-vpn.org/
• http://www.ntop.org/n2n/
• OLSR
• B.A.T.M.A.N.

• See our forum: Howto: IPSec and OpenVPN
• A whole load of OpenVPN-related articles can be found on the Project Homepage of OpenVPN:
  • http://openvpn.net/index.php/open-source/faq.html#bridge2
  • http://www.openvpn.net/index.php/component/content/article/60-faq/84-faq.html
  • http://www.openvpn.net/index.php/component/content/article/65-general/89-2xhowto.html
  • http://www.openvpn.net/index.php/open-source/documentation/miscellaneous/1xhowto.html
  • You can alway RTFM: http://www.openvpn.net/index.php/open-source/documentation/manuals.html or STFW: http://www.google.com/search?q=vpn&hl=en
• You do not need to read all of them, to get a VPN solution going. But for security reasons sooner or later you should make sure that all participant comprehend how your VPN works.