Dhcp not updating dns ptr records
``So what if my host leaks a few packets to the global Internet? '' The reason is that inconsistent configuration between your home hosts and your local DNS servers can, and often does, cause leakage of DNS updates for private IP addresses to the global Internet.
NOTE Indirectly connected computers, such as those on a LAN that connect to the Internet via certain default gateways, certain types of routers, proxy servers, or other indirect means, do not necessarily need to use TCP/IP.
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.
Only if you know with certainty that the updates get sent only to a local DNS server should you run the Dynamic DNS Updates service.
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.
The default configuration not only wastes global Internet resources but also introduces a multitude of security, privacy and intellectual property concerns.