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.. _message-edns:
Message EDNS Options
--------------------
EDNS allows for larger messages and also provides an extension
mechanism for the protocol. EDNS *options* are typed data, and are
treated much like Rdata. For example, if dnsython encouters the EDNS
``ECS`` option code when parsing a DNS wire format message, it
will create a ``dns.edns.ECSOption`` object to represent it.
.. autodata:: dns.edns.NSID
.. autodata:: dns.edns.DAU
.. autodata:: dns.edns.DHU
.. autodata:: dns.edns.N3U
.. autodata:: dns.edns.ECS
.. autodata:: dns.edns.EXPIRE
.. autodata:: dns.edns.COOKIE
.. autodata:: dns.edns.KEEPALIVE
.. autodata:: dns.edns.PADDING
.. autodata:: dns.edns.CHAIN
.. autoclass:: dns.edns.Option
:members:
.. autoclass:: dns.edns.GenericOption
:members:
.. autoclass:: dns.edns.ECSOption
:members:
.. autofunction:: dns.edns.get_option_class
.. autofunction:: dns.edns.option_from_wire_parser
.. autofunction:: dns.edns.option_from_wire
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