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Updating zserver dyndns

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.

Leakage of private DNS updates is caused by inconsistent configuration between DNS servers and DHCP client/server entities.The following list illustrates a typical example of how a private DNS update leaks out to the global Internet. The DHCP client first sends a query to its local domain name server (LDNS) and asks for the authoritative server for the zone of its domain name (step 3).Once the DHCP client receives a response (step 4), it sends the update to the indicated server (step 5).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.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 LDNS thus iteratively sends the SOA request, starting with a root DNS server, and eventually returns the server (step 8).Over 97% of DNS updates that leak onto the global Internet come from Microsoft Windows™ operating systems (see companion paper on The Windows of Private DNS Updates).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.

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