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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``
on router ``R3``
on router ``R5``
on router ``R4``
on router ``R6``
What do you think about the proposed configuration?
Sometimes, static routes must be configured on networks to enforce certain paths. Consider the six routers network shown in the figure below.
In this network, we will focus on four IPv6 prefixes :
``p:0000::/64`` used on the link ``A1-R1``. ``A1`` uses address ``p:0000::A1/64``
``p:0001::/64`` used on the link ``A2-R3``. ``A2`` uses address ``p:0001::A2/64``
``p:0002::/64`` used on the link ``B1-R5``. ``B1`` uses address ``p:0002::B1/64``
``p:0003::/64`` used on the link ``B2-R6``. ``B2`` uses address ``p:0003::B2/64``
Can you configure the forwarding tables of the six routers to achieve the following network objectives :
All packets sent by ``B1`` and ``B2`` to ``A1`` and ``A2`` are always forwarded via ``R2`` while all packets from ``A1`` and ``A2`` are always forwarded via ``R4``
The packets whose destinations are ``A1``, ``A2``, ``B1`` or ``B2`` are never forwarded via router ``R4``
The packets sent by ``A1`` or ``A2`` towards ``B1`` are always forwarded via ``R2`` while the packets towards ``B2`` are always forwarded via ``R4``.
When creating these forwarding tables, try to minimize the number of entries that you install on each router.
When a network is designed, an important element of the design is the IP address allocation plan. A good allocation plan can provide flexibility and help to reduce the size of the forwarding tables.

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Source string location
../../exercises/ipv6.rst:384
String age
2 years ago
Source string age
2 years ago
Translation file
locale/pot/exercises/ipv6.pot, string 38