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2. IP address blocking - Wikipedia

   en.wikipedia.org/wiki/IP_address_blocking

   Unix-like operating systems commonly implement IP address blocking using a TCP wrapper, configured by host access control files /etc/hosts.deny and /etc/hosts.allow.. Both companies and schools offering remote user access use Linux programs such as DenyHosts or Fail2ban for protection from unauthorized access while allowing permitted remote access.

3. Virtual private network - Wikipedia

   en.wikipedia.org/wiki/Virtual_private_network

   Virtual private network (VPN) is a network architecture for virtually extending a private network (i.e. any computer network which is not the public Internet) across one or multiple other networks which are either untrusted (as they are not controlled by the entity aiming to implement the VPN) or need to be isolated (thus making the lower network invisible or not directly usable).

4. Layer 2 Tunneling Protocol - Wikipedia

   en.wikipedia.org/wiki/Layer_2_Tunneling_Protocol

   In computer networking, Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs.

5. Zero-configuration networking - Wikipedia

   en.wikipedia.org/wiki/Zero-configuration_networking

   Zero-configuration networking (zeroconf) is a set of technologies that automatically creates a usable computer network based on the Internet Protocol Suite (TCP/IP) when computers or network peripherals are interconnected. It does not require manual operator intervention or special configuration servers.

6. Neighbor Discovery Protocol - Wikipedia

   en.wikipedia.org/wiki/Neighbor_Discovery_Protocol

   The Neighbor Discovery Protocol (NDP), or simply Neighbor Discovery (ND), is a protocol of the Internet protocol suite used with Internet Protocol Version 6 (IPv6). [1]: §1 It operates at the internet layer of the Internet model, [2] and is responsible for gathering various information required for network communication, including the configuration of local connections and the domain name ...

7. VPN service - Wikipedia

   en.wikipedia.org/wiki/VPN_service

   A VPN service does not make one's Internet use private. Users can still be tracked through tracking cookies and device fingerprinting, even if the user's IP address is hidden. [15] A VPN service can log the user's traffic, although this depends on the VPN provider. [15] A VPN service does not make the user immune to cyberattacks. [15]