Stupid question: from what I understood by reading https://bugs.launchpad.net/ubuntu/+s...tp/+bug/374896, among other things, if you configure the interface to do dhcp boot and the dhcp server provide ntp info, /etc/dhcp/dhclient.conf causes ntp.conf.dhcp to be created. Is that so?
I have a ubuntu server setup as a router (among other things), I now am adding a dhcp server to it. When configuring isc-dhcp-server, the /etc/dhcp/dhcpd.conf file has an option called ddns-update-style, which can be set to ad-hoc, interim, standard, none. I have two nics (em1,em2). em1 is set to dhcp for my isp which gives me my public ip address.