Dhcp not updating on dns

In the initial stages of the Internet (ARPANET) addressing of hosts on the network was achieved by static translation tables that mapped hostnames to IP addresses.

The tables were maintained manually in form of the host file.

IP addresses, once assigned to a particular host, rarely changed and the mechanism was initially sufficient.

However, the rapid growth of the Internet and the proliferation of personal computers in the workplace and in homes created the substantial burden for administrators of keeping track of assigned IP addresses and managing their address space.

The first is "standards-based DNS updates", which uses an extension of the DNS protocol to ask for an update; this is often used for company laptops to register their address.

The second is usually a web-based protocol, normally a single HTTP fetch with username and password which then updates some DNS records (by some unspecified method); this is commonly used for a domestic computer to register itself by a publicly-known name in order to be found by a wider group, for example as a games server or webcam.

Due to the distributed nature of the DNS systems and its registrars, updates to the global DNS system may take hours to distribute.

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.

These clients provide a persistent addressing method for devices that change their location, configuration or IP address frequently.

This feature required that DNS servers be kept current automatically as well.

The first implementations of dynamic DNS fulfilled this purpose: Host computers gained the feature to notify their respective DNS server of the address they had received from a DHCP server or through self-configuration.

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.

Today, numerous providers, called Dynamic DNS service providers, offer such technology and services on the Internet.

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This protocol-based DNS update method was documented and standardized in IETF publication RFC 2136 in 1997 and has become a standard part of the DNS protocol (see also nsupdate program).

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