Dns updating info

Posted by / 03-Nov-2014 05:10

Dynamic DNS is a method that allows you to notify a Domain Name Server (DNS) to change in your active DNS configuration on a device such as a router or computer of its configured hostname and address.It is most useful when your computer or network obtains a new IP address lease and you would like to dynamically associate a hostname with that address, without having to manually enter the change every time.We have also provided some dynamic dns reviews on various hosting companies to help you better decide who to choose!If you like this list, please link to it will help others find this free list more easily!This results in your DNS data being inconsistent for only 5 seconds instead of an hour as in the initial example.Don't forget however to increase the TTL again, after changing the record and assuring that your change was successful.If you just changed the record now, DNS resolvers all over the world who don't have the old data cached would instantly see the new IP address ( DNS resolvers who do have this record cached (e.g.

And let's further assume that you now want to update this A record so that it points to the IP address

Although this works very well for general DNS queries if you want to do a direct DNS query to a specified DNS server (rather than using OS resolution) try PHPDNS: can do direct (TCP or UDP) low-level queries to a nameserver and recurse at will.

Very useful for testing specific servers and also for walking through a recursive resolution.

If for example, there was some webserver behind those IPs, some browsers would now be accessing your old webserver (on the old IP) and some would request data from your new webserver (on the new IP). So we'd have had to wait 1 hour in our last example after reducing the TTL to 30 because the old TTL was 1 hour. Or you can now even further reduce the TTL to 5 seconds.

The easy solution to this inconsistent state is as follows: First reduce the TTL of the record that you want to change to a minimal value, e.g. Then wait 30 seconds, and then do the actual update to the record.

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DNS helps to translate that name into an actual location (IP address).

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