Skip to content

Disable ipv6 on Linux

There are several ways to do disable ipv6, here I show few of the ones I know available

Check if ipv6 is kernel read

test -f /proc/net/if_inet6 && echo "Running kernel is IPv6 ready"

Check if ipv6 is enable system wide

[ "$(sysctl -n net.ipv6.conf.all.disable_ipv6)" -eq 0 ] \
  && echo "IPv6 enabled system-wide" \
  || echo "IPv6 disabled system-wide"

Edit sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
  • Apply Changes: Run sysctl -p to load the new settings

Grub

Edit GRUB: Open /etc/default/grub and find the GRUB_CMDLINE_LINUX_DEFAULT line

GRUB_CMDLINE_LINUX="ipv6.disable=1"

Update grub

grub-mkconfig -o /boot/grub/grub.cfg

Temporary disable ipv6 for current session

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
  • Enable above settings temporary by type sysctl -p

Permanent disable ipv6 in /etc/systctl.conf

cat <<EOF > /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
EOF;sysctl -p