:ref:`d2-ctrl-channel` to learn how the socket configuration is
specified for the DHCPv4, DHCPv6, and D2 services.
-.. warning::
-
- ``dhcp4-server``, ``dhcp6-server``, and ``d2-server`` were renamed to
- ``dhcp4``, ``dhcp6``, and ``d2`` respectively in Kea 1.2. If
- migrating from Kea 1.2, be sure to modify the CA configuration to use
- this new naming convention.
-
User contexts can store arbitrary data as long as they are in valid JSON
syntax and their top-level element is a map (i.e. the data must be
enclosed in curly brackets). Some hook libraries may expect specific