DNS on Lin's Blog

How to Check Whether a Domain's DNS Is Set Up Correctly?

Tue, 01 Feb 2011 18:00:25 +0000

Anyone who runs a website has probably set up DNS records for a domain many times. You probably also know that after you change DNS, it takes 12 to 24 hours before the change takes effect. That is because ISPs need to clear their DNS caches. A DNS mapping is not applied instantly. It takes some time before it works. So today I want to introduce a command that lets you check whether a given domain points to the correct IP address.

DNS Firewall - Block Access to Specific Websites and Quickly Edit DNS Mappings

Fri, 21 Jan 2011 11:46:20 +0000

DNS Firewall is a program recently written by a webmaster. Its main function is to block access to certain websites. For example, if you have kids at home and you don't want them visiting adult sites or Facebook, you enter the URLs of those two sites into the program, and then this computer can no longer connect to them! The principle behind DNS Firewall is actually very simple. It modifies the hosts file built into Windows and maps the DNS entries of the blocked sites to 127.0.0.1, which is your own computer, so the browser simply can't reach those sites xD

Let Google Protect Your Browsing - Google Public DNS

Sat, 02 Jan 2010 17:27:13 +0000

Google Public DNS is a service Google recently launched that lets you browse the web using Google’s free DNS. The benefit of Google Public DNS is that it makes your browsing safer, and your browsing speed may also improve. By the way, openDNS also offers a DNS service, and it’s pretty good too, so feel free to check it out. Google Public DNS is also one of the few Google services that doesn’t require going to a website to use it (you just configure it directly on your computer).