An RFC-standard tool for global IP address range assignment. CIDR reduces the size of Internet routers' IP routing tables, helping deal with the rapid growth of the Internet. The term classless refers to the fact that the summarized groups of networks represent a group of addresses that do not conform to IPv4 classful (Class A, B, and C) grouping rules.
A NAT term referring to the IP address used for a host inside the trusted part of the network, but in packets as they traverse the global (untrusted) part of the network.
A NAT term referring to the IP address used for a host inside the trusted part of the network, but in packets as the traverse the local (trusted) part of the network.
NAT overload // PAT
A NAT feature in which one Inside Global IP address supports more than 65,000 concurrent TCP and UDP connections
A NAT term referring to an IP address used for a host in the outside (untrusted) part of the network, for packets as they traverse the outside part of the network, which is usually the global Internet
A NAT term referring to an IP address used for a host in the outside (untrusted) part of the network, for packets as the traverse the inside (trusted), or local, part of the network.
private IP network
One of several classful IPv4 network numbers that will never be assigned for use in the Internet, meant for use inside a single enterprise
In IPv6, a mode of operation in which a host or router runs both IPv4 and IPv6
global unicast address
A type of IPv6 address that has been allocated from a range of public globally unique IP addresses as registered through ICANN, its member agencies, and other registries or ISPs
In IPv6, the prefix that describes an address block that has been assigned to an ISP by some Internet registry
link local address
A type of unicast IPv6 address that represents an interface on a single data link. Packets sent to a link local address cross only that particular link and are never forwarded to other subnets by a router. Used for communications that do not need to leave the local link, such as neighbor discovery
An IPv6 feature in which packets are translated between IPv4 and IPv6
Neighbor Discovery Protocol (NDP)
A protocol that is part of the IPv6 protocol suite, used to discover and exchange information about devices on the same subnet (neighbors). In particular, it replaces the IPv4 ARP protocol
Regional Internet Registry (RIR)
The generic term for one of five current organizations that are responsible for assigning the public, globally unique IPv4 and IPv6 address space.
In IPv6, the prefix that describes a block of public, globally unique IPv6 addresses assigned to a Regional Internet Registry by ICANN
In IPv6, the prefix that describes a public globally unique IPv6 address block that has been assigned to an end-user organization (for example, an Enterprise or government agency). The assignment typically is made by an ISP or Internet registry
A term used in IPv6 to contrast with stateless DHCP. Stateful DHCP keeps track of which clients have been assigned which IPv6 addresses (state information).
A feature of IPv6 in which a host or router can be assigned an IPv6 unicast address without the need for a stateful DHCP server.
A term used in IPv6 to contrast with stateful DHCP. Stateless DHCP servers don't lease IPv6 addresses to clients. Instead, they supply other useful information, such as DNS server IP addresses, but with no need to track the information about the clients (state information).
In IPv6, a term for the prefix that is assigned to each data link, acting like a subnet in IPv4.
unique local address
A type of IPv6 unicast address meant as a replacement for IPv4 private addresses.