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Blacklist Ad Content Delivery Domains 

This is how I block advertisement at DNS level on OpenWRT.
Blocking at DNS level is advisable because it does not impact bandwidth and latency.
Simply said it tricks your computer that your loopback address is where adserver are located but cannot be found so adservers are ignored totally.
AdServers are becoming more and more of a nuisance.

1. They serve up malware advertisement, 
2. They load flash advertisements which waste bandwidth and increase latency. 
3. They run javascripts to try and "take over" your web browser via redirection and popups.

If you run adblocker on client computers it becomes harder to manage when the number of client systems increase.
Fortunately OpenWRT makes this easy with the use of dnsmasq.
My web surfing experience has since greatly improved since
Here is how to do it in 2 steps(Yes it is that simple and powerful with Linux):

1.  SSH into your router
2. Copy and paste this Command into the terminal

wget -O /etc/dnsmasq.conf "http://pgl.yoyo.org/as/serverlist.php?hostformat=dnsmasq&showintro=1&startdate[day]=&startdate[month]=&startdate[year]=&mimetype=plaintext" && /etc/init.d/dnsmasq restart

What this script does is telling your Router to http://pgl.yoyo.org/adservers/ to get a list of known adservers in a dnsmasq friendly format and save it to /etc/dnsmasq.conf if that command is successful then restart dnsmasq.

After that you will soon notice the disappearance of many irritating advertisement when using the web .
Hopefully this improves your web surfing experience as well as let you realise and embrace the power of shell scripting.

If you want to point the ip address to 0.0.0.0 (invalid ip) instead of 127.0.0.1(loopback)

sed -e s/127.0.0.1/0.0.0.0/g -i /etc/dnsmasq.conf && /etc/init.d/dnsmasq restart