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The first is "dynamic DNS updating" which refers to systems that are used to update traditional DNS records without manual editing.These mechanisms are explained in RFC 2136, and use the TSIG mechanism to provide security.DHCP became an important tool for ISPs as well to manage their address spaces for connecting home and small-business end-users with a single IP address each by implementing network address translation (NAT) at the customer-premises router.
Thus DNS is only suitable for services that do not change their IP address very often, as is the case for most large services like Wikipedia.
The Domain Name System brought a method of distributing the same address information automatically online through recursive queries to remote databases configured for each network, or domain.
Even this DNS facility still used static lookup tables at each participating node.
The Dynamic Host Configuration Protocol (DHCP) allowed enterprises and Internet service providers (ISPs) to assign addresses to computers automatically as they powered up.
In addition, this helped conserve the address space available, since not all devices might be actively used at all times and addresses could be assigned as needed.
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This, however, broke the end-to-end principle of Internet architecture and methods were required to allow private networks, with frequently changing external IP addresses, to discover their public address and insert it into the Domain Name System in order to participate in Internet communications properly.