Get Rid of Public DNS (nsd4) is not running (port 53). on Mail-in-a-Box

It’s really annoying to see cross marks on status checks on Mail-in-a-Box, it’s simply because your box doesn’t have an IPV6 or it’s been disabled. Having said that, we just simply re-enable it.

sudo sysctl -w net.ipv6.conf.all.disable_ipv6=0

sudo sysctl -w net.ipv6.conf.default.disable_ipv6=0

sudo service nsd start