(OK) Lineage-14.1(Android 7) - enable eth0 to get ipv6 address
if "ip -6 addr add" --> "Permission denied"
then
echo 0 > /proc/sys/net/ipv6/conf/eth0/disable_ipv6
if "ip -6 addr add" --> "Permission denied"
then
echo 0 > /proc/sys/net/ipv6/conf/eth0/disable_ipv6