Blocking ads on the chromecast

I personally do not like using a chromecast (opensource ftw) but
we have one and other people do. One thing I really hate about it,
is ads. Although hacking the chromecast is beyond my skill level,
and obviously there is no config option for turning them off, the
chromecast still utilizes the local network to get ads and therefore
can be blocked at the router level.

Most router OS's from the manufacturer are crippled beyond even the
most basic functionality so I flashed mine with Shibby's tomato
firmware from http://tomato.groov.pl

To block ads on the chromecast then involves first a network-wide
adblocker, which the tomato firmware easily provides in its web
interface. This is not sufficient however as ads are only blocked
if the host is using the router as its dns server. The chromecast
has been hardcoded to use google's dns servers so we then set a
couple static routing rules to send requests to 8.8.8.8 and 8.8.4.4
to the router at 192.168.1.1.
Together, we have an ad-free experience :)

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