IPv6

A script to disable IPv6 on your Linux machine

Simply create a file using the following command:

sudo nano ipv6_disable.sh

Copy and paste the following commands into the file:

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# INSTALLING AND CONFIGURING IPTABLES PERSISTENT AND DISABLING IPV6
echo ""
echo "INSTALLING IPTABLES PERSISTENT....................."
sleep 1
sudo apt install iptables-persistent -y
echo "IPTABLES PERSISTENT INSTALLED!"
sleep 1

echo ""
echo "DISABLING IPV6 VIA IPTABLES....................."
sleep 1
sudo ip6tables -P INPUT DROP
sudo ip6tables -P FORWARD DROP
sudo ip6tables-save | sudo tee /etc/iptables/rules.v6
echo "IPV6 RULES SAVED!"
sleep 1

sudo cp /etc/sysctl.conf /etc/sysctl.conf.bak

echo "Backup of /etc/sysctl.conf created at /etc/sysctl.conf.bak"

echo ""
echo "MODIFYING /etc/sysctl.conf TO DISABLE IPV6....................."
sleep 1
sudo sed -i '/^net.ipv6.conf.all.disable_ipv6/d' /etc/sysctl.conf
sudo sed -i '/^net.ipv6.conf.default.disable_ipv6/d' /etc/sysctl.conf
sudo sed -i '/^net.ipv6.conf.lo.disable_ipv6/d' /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "CHANGES TO /etc/sysctl.conf SAVED!"
sleep 1

sudo cp /etc/ufw/sysctl.conf /etc/ufw/sysctl.conf.bak

echo "Backup of /etc/ufw/sysctl.conf created at /etc/ufw/sysctl.conf.bak"

echo ""
echo "MODIFYING /etc/ufw/sysctl.conf....................."
sleep 1
sudo sed -i 's/^net\/ipv6\/conf\/all\/accept_redirects=0/#net\/ipv6\/conf\/all\/accept_redirects=0/' /etc/ufw/sysctl.conf
sudo sed -i 's/^net\/ipv6\/conf\/default\/accept_redirects=0/#net\/ipv6\/conf\/default\/accept_redirects=0/' /etc/ufw/sysctl.conf
sudo sed -i 's/^#net\/ipv6\/conf\/default\/autoconf=1/net\/ipv6\/conf\/default\/autoconf=1/' /etc/ufw/sysctl.conf
sudo sed -i 's/^#net\/ipv6\/conf\/all\/autoconf=1/net\/ipv6\/conf\/all\/autoconf=1/' /etc/ufw/sysctl.conf
echo "CHANGES TO /etc/ufw/sysctl.conf SAVED!"
echo ""
echo "Resetting to apply changes"
sysctl -p
sleep 1

echo ""
echo "CONFIGURATION COMPLETE!"

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then hit Ctl+O and Enter to save, Ctl+X to exit

Make the file executable by running this command:

sudo chmod +x ipv6_disable.sh

Now run the script like this:

sudo bash ipv6_disable.sh

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