My secondary B3 does not update resolv.conf with info from DHCP. It's running Arch (sakaki build). All updated to newest packages. It simply leaves resolv.conf with:
The proper B3 has:# This file is managed by systemd-resolved(8). Do not edit.
#
# Third party programs must not access this file directly, but
# only through the symlink at /etc/resolv.conf. To manage
# resolv.conf(5) in a different way, replace the symlink by a
# static file or a different symlink.
# No DNS servers known.
Please help, I've been fighting this for the last 3 hours ;( The only info I seem to be able to find on Google is the exact opposite - "how to prevent DHCP from overwriting resolv.conf".# Generated by resolvconf
domain <my-domain>
nameserver <ns-1>
nameserver <ns-2>