Evaggelos Balaskas - System Engineer

The sky above the port was the color of television, tuned to a dead channel

Jun

2015

Removing Ads with your PowerDNS Resolver

Posted by ebal at 21:45:54 in blog, planet_ellak, planet_Sysadmin, planet_fsfe

In my previous post , I documented my notes on setting up a new PowerDNS Recursor for our own clients.

In this post, I will present a simple way to reduce unnecessary traffic by blocking every FQDN you dont want.

Download a well known custom HOSTS file:

# curl -s -L http://winhelp2002.mvps.org/hosts.txt -o /etc/pdns-recursor/hosts.blocked

Add your FQDNs you want to block,

eg.
# echo "0.0.0.0 facebook.com" >> /etc/pdns-recursor/hosts.blocked

be very careful not to block something you need.
Reminder: No support for wildcards, only FQDNs

Edit your /etc/pdns-recursor/recursor.conf to support the new hosts file:

etc-hosts-file=/etc/pdns-recursor/hosts.blocked
export-etc-hosts=on

restart your pdns and test it

# dig www.facebook.com @localhost

;; ANSWER SECTION:
www.facebook.com.   86400   IN  A   0.0.0.0

Once you have done that, you can edit your hosts.blocked when ever you want!
But dont forget to reload:

# rec_control reload-zones

Tag(s): PowerDNS