A list of one or more :term:`ip_address`, :term:`netprefix`, :term:`server_key`, or :term:`acl_name` elements; see :ref:`address_match_lists`.
``remote-servers``
- A named list of one or more :term:`ip_address` s with optional ``tls_id``, :term:`server_key`, and/or :term:`port`. A ``remote-servers`` list may include other ``remote-servers`` lists. See :any:`primaries` block.
+ A named list of one or more :term:`ip_address` s with optional :term:`tls_id`, :term:`server_key`, and/or :term:`port`. A ``remote-servers`` list may include other ``remote-servers`` lists. See :any:`primaries` block.
``domain_name``
A quoted string which is used as a DNS name; for example: ``my.test.domain``.
:namedconf:ref:`key` blocks.
``tls_id``
- A string representing a TLS configuration object, including a key and certificate.
+ A name of TLS configuration object which defines TLS key and certificate. See :any:`tls` block.
``number``
A non-negative 32-bit integer (i.e., a number between 0 and 4294967295, inclusive). Its acceptable value might be further limited by the context in which it is used.