While this is not a recommended practice for reasons that we shall see later, it may be simply a pragmatic solution.Finally, each PC has what is sometimes, but erroneously, called a resolver, which typically caches results.
RFC compliant dynamic DNS (not DDNS based on external updates like a HTTP channel) can be complicated to troubleshoot.
Below is a simplified description of the dynamic update process with information of common issues in each step that can lead to a dynamic DNS update failure.
While ISPs are delegated the task of reverse-mapping public IPs, they have no such responsibility for private IP addresses. 14 IN PTR joe., which was probably not the intended result.
If you are running your own local recursive name server, it is your responsibility to make sure these IP addresses are reverse-mapped in your DNS configuration. Just over 1% of the queries at the root-servers in one of the studies were for localhost.
There are now well over 100 instances of the various root-servers in operational use, the majority of which now lie outside North America.
The root-servers receive more than 2 billion queries per day, of which (according to some studies ,) only 2% are legitimate queries!I perform a Master and Slave configuration, create a dump of Master station DB, restore it on Slave station and run replication.Everything looks fine but no updates are reflected on Slave.In fact this is almost always a stub-resolver that needs the services of a caching or recursive name server to operate effectively, since it is incapable of following referrals.The root servers are always the starting point for any new query cycle, which makes them the critical part of the critical infrastructure! Using anycast techniques, these servers are replicated across the globe.Apart from creating unnecessary root-server traffic, it will slow down applications considerably.