![]() ![]() ![]() This is what necessitated the development of Network Address Translation (NAT). Utilizing private address space gave network operators a much larger pool to use internally than would otherwise have been available if utilizing globally assigned address space - but if they wanted to connect to the global Internet, they needed something to translate those addresses. In 1996, the IETF was back at it again, creating RFC 1918 private addressing, so that networks could utilize private addresses that didn't come from the global pool. Later came DHCP, another protocol which assisted via the use of short term allocation of addresses which would be given back to the provider's pool after use. In the early 90s, the IETF gave us Classless Inter-Domain Routing (CIDR), which dramatically slowed the growth of global Internet routing tables and delayed the inevitable IPv4 address depletion. IPv4 addressing, and the well-known depletion associated with it, is one such area that has seen a plethora of mechanisms employed in order to give it more shelf life. The Internet has a very long history of utilizing mechanisms that may breathe new life into older technologies, stretching it out so that newer technologies may be delayed or obviated altogether. How to configure NAT & PAT on Cisco router?
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