DISABLE IPV6 (Debian)
root@fs18ast16:~# ee /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.enp0s3.disable_ipv6 = 1
root@fs18ast16:~# sysctl -p
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.enp0s3.disable_ipv6 = 1
root@fs:/home/teee# ee /etc/sysctl.d/70-disable-ipv6.conf
net.ipv6.conf.all.disable_ipv6 = 1
root@fs:/home/teee# ee /etc/default/grub
GRUB_CMDLINE_LINUX=”ipv6.disable=1″