|
IPv6 Networks
|
Réseaux IPv6
|
|
Basic questions on IPv6 Networks
|
|
|
Before starting to determine the paths that packets will follow in an IPv6 network, it is important to remember how to convert IPv6 addresses in binary numbers.
|
|
|
An IPv6 forwarding table contains a list of IPv6 prefixes with their associated nexthop or outgoing interface. When an IPv6 router receives a packet, it forwards it according to its forwarding table. Note that IPv6 routers forward packets along the *longest match* between the destination address of the packet and the routes in the forwarding table.
|
|
|
Now that you master the basics, you can determine the paths followed by IPv6 packets in simple networks.
|
|
|
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
|
|
