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A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example: To indicate the size of a network or subnet for some routing protocols, such as OSPF. To indicate what IP addresses should be permitted or denied in access control lists ...
The IP address of the destination is used to make decisions about routing IP packets to other networks. IPv6 is the successor to the first addressing infrastructure of the Internet, Internet Protocol version 4 (IPv4). In contrast to IPv4, which defined an IP address as a 32-bit value, IPv6 addresses have a size of 128 bits.
AF_INET and AF_INET6 address families and their corresponding protocol families, PF_INET and PF_INET6. These include standard IP addresses and TCP and UDP port numbers. sys/un.h: PF_UNIX and PF_LOCAL address family. Used for local communication between programs running on the same computer. arpa/inet.h: Functions for manipulating numeric IP ...