Ubuntu 16, Bind and disabling ipv6

I furiously tried to convert bind to operate only on ipv4 addresses but no success.

Ubuntu way is to add-4 to OPTIONS at /etc/default/bind9

-> No success 

After googling I found out the systemd has hijacked the startup and does not use the bind9-config file at all.

A proper script to modify is /lib/systemd/system/bind9.service
..
ExecStart=/usr/sbin/named -f -u bind
->
ExecStart=/usr/sbin/named -4 -f -u bind

Save and

systemctl daemon-reload

service bind9 restart

-> Success

 

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