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2. 1.1.1.1 - Wikipedia

   en.wikipedia.org/wiki/1.1.1.1

   1.1.1.1 is a free Domain Name System (DNS) service by the American company Cloudflare in partnership with APNIC. [ 7 ] [ needs update ] The service functions as a recursive name server , providing domain name resolution for any host on the Internet .

3. OpenVPN - Wikipedia

   en.wikipedia.org/wiki/OpenVPN

   OpenVPN has several ways to authenticate peers with each other. OpenVPN offers pre-shared keys, certificate-based, and username/password-based authentication.Preshared secret key is the easiest, and certificate-based is the most robust and feature-rich.

4. Fortinet - Wikipedia

   en.wikipedia.org/wiki/Fortinet

   Fortinet, Inc. is an American cybersecurity company with headquarters in Sunnyvale, California. The company develops and sells security solutions like firewalls , endpoint security and intrusion detection systems .

5. Layer 2 Tunneling Protocol - Wikipedia

   en.wikipedia.org/wiki/Layer_2_Tunneling_Protocol

   The process of setting up an L2TP/IPsec VPN is as follows: Negotiation of IPsec security association (SA), typically through Internet key exchange (IKE). This is carried out over UDP port 500, and commonly uses either a shared password (so-called " pre-shared keys "), public keys, or X.509 certificates on both ends, although other keying ...

6. Internet Key Exchange - Wikipedia

   en.wikipedia.org/wiki/Internet_Key_Exchange

   There are several open source implementations of IPsec with associated IKE capabilities. On Linux, Libreswan, Openswan and strongSwan implementations provide an IKE daemon which can configure (i.e., establish SAs) to the KLIPS or XFRM/NETKEY kernel-based IPsec stacks. XFRM/NETKEY is the Linux native IPsec implementation available as of version 2.6.

7. NAT traversal - Wikipedia

   en.wikipedia.org/wiki/NAT_traversal

   In Windows XP, NAT traversal is enabled by default, but in Windows XP with Service Pack 2 it has been disabled by default for the case when the VPN server is also behind a NAT device, because of a rare and controversial security issue. [6] IPsec NAT-T patches are also available for Windows 2000, Windows NT and Windows 98. [citation needed]