Greetings, Seeing how the ISC DHCP suite has reached EOL upstream, now might be a good time to re-visit Debian's choice of standard DHCP client shipping with priority:important.
I hereby propose bin:dhcpcd-base: 1) already supported by ifupdown. 2) dual stack (DHCPv4, Bonjour, RA, DHCPv6 with PD) with privilege separation. 3) writes both IPv4 and IPv6 name servers to /etc/resolv.conf 4) supports /etc/resolv.conf.head and /etc/resolv.conf.tail 5) a mere inet line in /etc/network/interfaces is sufficient to configure both stacks. While dhcpcd development became somewhat erratic last year due to upstream's health issues, things are seemingly back to normal. Additionally, a new developer has joined and is willing to take over the development should upstream's health deteriorate again. Martin-Éric