Ad-blocking software is great, but there are an increasing number of ways to detect and prevent people from viewing the site content.
I found that by creating an ad-blocking DNS resolver, this would effectively simulate a connection issue when communicating with one of the advert servers, therefore not triggering this software, albeit having a few broken images on a page, etc.
Its pretty easy to do, and with my auto update script (available below) hosted on BitBucket, it can be built, updated and running within a few minutes.
To build this wonder, you need to install PowerDNS. For Ubuntu based machines, you can run the following:
sudo apt-get install mysql-server mysql-client \ pdns-server pdns-backend-mysql
..and follow the on-screen instructions. This will install and configure powerDNS and also set up mysql if you have not got it installed and configure the appropriate tables.
After this step, create a new database user in MySQL for the update script using the MySQL command line (type
mysql -uroot -p on the command line, followed by your MySQL root password):
GRANT ALL ON pdns.* TO 'pdnsadmin'@'127.0.0.1' IDENTIFIED BY 'password';
The username (
pdnsadmin) and the password (please dont use ‘
password‘) are required for the update script. This can be downloaded from my repo here:
Updating the line:
$mysqli = new mysqli('127.0.0.1', '**MYSQL USERNAME**', '**MYSQL PASSWORD**', 'pdns');
with your MySQL login details.
Next, you need to edit
/etc/powerdns/pdns.conf, and make the following changes:
allow_recursion=0.0.0.0/0, uncomment it and set your IP range you wish to serve to, or leave set to
0.0.0.0/0 if you are behind a firewall.
recursor=no, uncomment it (if it is commented out), and replace ‘
no‘ with the IP address of a trusted DNS resolver (eg
188.8.131.52 for OpenDNS).
Save the changes and restart powerDNS:
service pdns restart
Next, run the update script. This will download a mahoosive file from hpHosts and convert it into the DNS records required for powerDNS.
That’s it. All you need to do now is to set your computer / router / DNS server to resolve from your box, and the majority of adverts and malware will disappear!