BlackBlockGoogle

Methods
There are different methods for blocking google..

Using ublock
Install the extension ublock origin on your firefox installation.

1. Open ublock dashboard

2. Select the tab "My filters"

3. Past this list hosts to your ublock configuration.

Blocking using hosts file
You can edit your hosts file.

An axample of hosts file, it contains a whole list of all google, twitter, facebook, etc... domains Doing this all listed domains will be redirected to that ip address. You can easily change the ip addresses whit your local host 127.0.0.1 or whatever you want :)

Using OpenWRT / iptables
This is a script that would run on OpenWRT:

With some modification (maybe) to the output processing of the nslookup command, or use host, it'll work on your local *NIX box

You would do, for example:
 * root@OpenWrt:~# ./iptsetup.sh google.com gl 1
 * That would create for you add_gl.sh and del_gl.sh in the current working directory.
 * Then run ./add_gl.sh and all packets destined to google will be marked with MARK 1
 * So add a rule something like:

iptables -N reject iptables -A OUTPUT -m mark --mark 1 -j reject iptables -A reject -p tcp -j REJECT --reject-with tcp-reset iptables -A reject -j REJECT --reject-with icmp-port-unreachable


 * You also need to feed traffic into the m_ip chain in your mangle table.
 * How you might wish to do this is left as an exercise to the reader ;-) (don't just blindly "follow", Read up!!)

But for example, you could do something as simple as this, seeing as how you are running on a router:

iptables -t mangle -A PREROUTING -s lan-ip.of.user-that-not-want.google -j m_ip

IP=`nslookup $1 | grep -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | tail -n1 | cut -d\ -f3` AS=`wget -q -O - http://ipinfo.io/$IP/org | cut -f1 -d \ | sed -e 's/AS//'`
 * 1) !/bin/sh
 * 2) iptsetup.sh domain.com name fwmark#
 * 1) iptsetup.sh domain.com name fwmark#

echo '#!/bin/sh' > add_$2.sh chmod 750 add_$2.sh echo '#!/bin/sh' > del_$2.sh chmod 750 del_$2.sh NETWORKS=`wget -O - http://stat.ripe.net/data/announced-prefixes/data.yaml?resource=$AS|grep prefix\:|grep -v \:\:|awk '{print $3}'`

echo "iptables -t mangle -N $2_ip" >> add_$2.sh echo "iptables -t mangle -N $2_do" >> add_$2.sh echo "iptables -t mangle -A m_ip -j $2_ip" >> add_$2.sh echo "iptables -t mangle -D m_ip -j $2_ip" >> del_$2.sh

for i in $NETWORKS; do echo "iptables -t mangle -A $2_ip -d $i -j $2_do" >> add_$2.sh; done for i in $NETWORKS; do echo "iptables -t mangle -D $2_ip -d $i -j $2_do" >> del_$2.sh; done

echo "iptables -t mangle -A $2_do -j MARK --set-mark $3" >> add_$2.sh echo "iptables -t mangle -D $2_do -j MARK --set-mark $3" >> del_$2.sh

echo "iptables -t mangle -X $2_ip" >> del_$2.sh echo "iptables -t mangle -X $2_do" >> del_$2.sh

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