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Open DNS resolvers and patching them !

Before getting to know what is an open resolver, you need to know what is recursion, ie recursive queries ! Suppose you have a DNS server configured and a local machine which uses your DNS server queries for a website. Imagine this query is a new one and its not in...

Troubleshooting issues with named !

When you have a server without any control panel, it becomes a pain in the arse to manage the services, especially the DNS service. You have got the tedious job of installing bind, altering the configuration file, manually creating the zone files and so on. Here are...

Named not starting in Plesk !

When trying to restart named, you get an error stating that some parameter is not given correctly in a zone file. It would be a reverse PTR zone file with name something like this: x.x.x.in-addr.arpa. Open the zone file using vim , like : # vim...

Too much denied named queries ?

When you have setup a production box, running with a DNS server ( named service, in this matter ), you get tones of queries. If you have disabled recursion, lesser the number of DNS workload. While going through your /var/log/messages, have you found lots of query (...

How do I clear my DNS cache !

The local DNS cache in your machine will store the locations  of web-servers/websites that contain pages which you have recently viewed. If the location of these pages have  changed, you will be unable to access them due to the local DNS cache ( the one cached by your...