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  2. 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]

  3. Virtual IP address - Wikipedia

    en.wikipedia.org/wiki/Virtual_IP_address

    A VIP address can be used to provide nearly unlimited mobility. For example, if an application has an IP address on a physical subnet, that application can be moved only to a host on that same subnet. VIP addresses can be advertised on their own subnet, [a] so its application can be moved anywhere on the reachable network without changing ...

  4. Network address translation - Wikipedia

    en.wikipedia.org/wiki/Network_address_translation

    Network address translation between a private network and the Internet. Network address translation (NAT) is a method of mapping an IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. [1]

  5. Carrier-grade NAT - Wikipedia

    en.wikipedia.org/wiki/Carrier-grade_NAT

    Carrier-grade NAT. Carrier-grade NAT (CGN or CGNAT), also known as large-scale NAT (LSN), is a type of network address translation (NAT) used by ISPs in IPv4 network design. With CGNAT, end sites, in particular residential networks, are configured with private network addresses that are translated to public IPv4 addresses by middlebox network address translator devices embedded in the network ...

  6. Reserved IP addresses - Wikipedia

    en.wikipedia.org/wiki/Reserved_IP_addresses

    Used for loopback addresses to the local host [1] 169.254.0.0/16 169.254.0.0–169.254.255.255 65 536: Subnet Used for link-local addresses [5] between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server 172.16.0.0/12 172.16.0.0–172.31.255.255 1 048 576: Private ...

  7. 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).

  8. Port forwarding - Wikipedia

    en.wikipedia.org/wiki/Port_forwarding

    Port forwarding via NAT router. In computer networking, port forwarding or port mapping is an application of network address translation (NAT) that redirects a communication request from one address and port number combination to another while the packets are traversing a network gateway, such as a router or firewall.

  9. Port Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Port_Control_Protocol

    Internally, PCP works by exchanging control messages between hosts and PCP-enabled NAT devices or firewalls (referred to as servers), using User Datagram Protocol (UDP) as the underlying protocol. This communication consists of port mapping requests created by the hosts that result in responses once submitted to and processed by the servers.