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Design questions
Consider the network shown in the figure below. In this network, the following addresses are used.
host ``A`` : ``2001:db8:1341:1::A`` and its default route points to ``2001:db8:1341:1::1``
host ``B`` : ``2001:db8:1341:4::B`` and its default route points to ``2001:db8:1341:4::4``
The routers have one address inside each network :
router ``R1`` uses address ``2001:db8:1341:1::1`` on its West interface, address ``2001:db8:1341:12::1`` on its East interface and address ``2001:db8:1341:13::1`` on its South interface
router ``R2`` uses address ``2001:db8:1341:12::2`` on its West interface, address ``2001:db8:1341:23::2`` on its South-West interface and address ``2001:db8:1341:24::2`` on its South interface.
router ``R3`` uses address ``2001:db8:1341:34::3`` on its East interface, address ``2001:db8:1341:23::3`` on its North-East interface and address ``2001:db8:1341:13::3`` on its North interface
router ``R4`` uses address ``2001:db8:1341:34::4`` on its West interface, address ``2001:db8:1341:24::4`` on its North interface and address ``2001:db8:1341:4::4`` on its East interface
The forwarding paths used in a network depend on the forwarding tables installed in the network nodes. Sometimes, these forwarding tables must be configured manually.
In this network, propose the forwarding tables of ``R2`` and ``R3`` that ensure that hosts ``A`` and ``B`` can exchange packets in both directions.
Consider the same network as in the previous question, but now the forwarding tables of ``R2`` and ``R3`` are configured as shown below :
In this network, select `all` the rules in the shown forwarding tables that ensure that the packets sent from ``A`` to ``B`` follow the reverse path of the packets sent by ``B`` to ``A``.
router ``R2`` uses address ``2001:db8:1341:12::2`` on its West interface, and address ``2001:db8:1341:24::2`` on its South interface
router ``R3`` uses address ``2001:db8:1341:34::3`` on its East interface and address ``2001:db8:1341:13::3`` on its North interface
Routers ``R2`` and ``R3`` are buggy in this network. Besides the routes for their local interfaces (not shown in the figure), they only have a default route which is shown in the figure below.
How do you configure the forwarding tables on ``R1`` and ``R4`` so that ``A`` can reach ``B`` and the reverse ?
Consider a slightly different network than in the previous question.
Assuming that the following IPv6 addresses are used :
router ``R1`` uses address ``2001:db8:1341:1::1`` on its West interface, address ``2001:db8:1341:12::1`` on its East interface, address ``2001:db8:1341:14::1`` on its South-East interface and address ``2001:db8:1341:13::1`` on its South interface
router ``R4`` uses address ``2001:db8:1341:34::4`` on its West interface, address ``2001:db8:1341:24::4`` on its North interface, address ``2001:db8:1341:14::4`` on its North-West interface and address ``2001:db8:1341:4::4`` on its East interface
Can you configure the forwarding tables so that the following paths are used by packets sent by host ``A`` to reach one of the four addresses of router ``R4``?
Do your forwarding tables impose the path used to reach host ``B`` which is attached to router ``R4`` or do you need to configure an additional entry in these tables ?
Consider the network below that contains only routers. This network has been configured by a group of students and you must verify whether the configuration is correct. All the IPv6 addresses are part of the same ``/48`` prefix that we name ``p``. The following subnets are defined in this ``/48`` prefix.
``p:12/64`` for the link between ``R1`` and ``R2``. On this subnet, ``R1`` uses address ``p:12::1`` while router ``R2`` uses address ``p:12::2``
``p:13/64`` for the link between ``R1`` and ``R3``. On this subnet, ``R1`` uses address ``p:13::1`` while router ``R3`` uses address ``p:13::3``
``p:24/64`` for the link between ``R2`` and ``R4``. On this subnet, ``R2`` uses address ``p:24::2`` while router ``R4`` uses address ``p:24::4``
...
The students have configured the following forwarding tables on these six routers.
on router ``R1``
on router ``R2``

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String information

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read-only
Source string location
../../exercises/ipv6.rst:154
String age
2 years ago
Source string age
2 years ago
Translation file
locale/pot/exercises/ipv6.pot, string 21