.. index:: pair: group; Changing MAC address and sending
.. _doxid-group__basic-mac__change__tx:

Changing MAC address and sending
================================

.. toctree::
	:hidden:

Check that MAC address can be changed and it affects source MAC address of sent packets.

Scenarios: X3-SYS17, X3-SYS19.



#. If **if_down** is ``TRUE`` and ``IPv6`` is checked, enable **keep_addr_on_down** setting for the IUT interface to avoid IPv6 address disappearance after brinding it down.

#. Create a CSAP on Tester to capture packets sent from IUT.

#. Establish connection between a pair of UDP sockets on IUT and Tester.

#. Send some data from IUT socket to peer, receive and check it.

#. Check packets captured by CSAP on Tester, their source MAC address should be **iut_lladdr**.

#. If **if_down** is ``TRUE``, set the IUT interface down.

#. Change MAC address to **iut_alien_mac** on the IUT interface. Check that the new address is reported for the interface after that.

#. If **if_down** is ``TRUE``, set the IUT interface up again.

#. Send some data from IUT socket to peer, receive and check it.

#. Check packets captured by CSAP on Tester, their source MAC address should be **iut_alien_mac**.

Dmitry Izbitsky `Dmitry.Izbitsky@oktetlabs.ru <mailto:Dmitry.Izbitsky@oktetlabs.ru>`__



.. rubric:: Parameters:

.. list-table::
	:widths: 20 80

	*
		- env

		- 
		  Testing environment:
		  
		  * :ref:`env.peer2peer <doxid-group__env-peer2peer>`
		  
		  * :ref:`env.peer2peer_ipv6 <doxid-group__env-peer2peer__ipv6>`

	*
		- if_down

		- If ``TRUE``, set the interface down before changing MAC address on it.