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Microsoft Windows operating systems support a feature that dynamically updates the mappings of domain names to associated IP addresses assigned to hosts by DHCP servers.

This automatic updating, called Dynamic DNS Updates service, reduces the administrative overhead associated with manually administering DNS records of network hosts.

The following steps only illustrate how to turn off dynamic DNS updates on Microsoft Windows™ systems.

For Linux or Free BSD systems that use ISC's DHCP client and server software, the dynamic DNS update feature gets set to off by default and requires manual intervention to turn on the service.

However, in many cases when the DHCP and DNS configurations have inconsistencies, the LDNS may direct the DHCP client to a place outside the local scope, resulting in leakage of private DNS updates to the global network.

In the example shown above, the LDNS is not configured with a local zone for 168.192.

The default configuration not only wastes global Internet resources but also introduces a multitude of security, privacy and intellectual property concerns.

Most home users who use DSL/Cable routers as DHCP/NAT servers to facilitate multiple host connections to the Internet should turn off dynamic DNS updates.Similarly, steps 6-8 update the inverse mapping from the IP address to the domain name (type PTR RR).In the correct setup, the LDNS should point the DHCP client to a domain name server (could be itself) inside the internal network.Note: “This is a modified configuration supported for DHCP servers running Windows Server 2008 and DHCP clients.In this mode, the DHCP server always performs updates of the client’s FQDN, leased IP address information, and both its host (A) and pointer (PTR) resource records, regardless of whether the client has requested to perform its own updates.” “With secure dynamic update, only the computers and users you specify in an ACL can create or modify dns Node objects within the zone.

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