cnp3-ebook/exercises/ipv6 — English @ Weblate

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54 ../../exercises/ipv6.rst:517

	English Assign IP subnets to all links in this network so that you can reduce the number of entries in the forwarding tables of all routers. Assume that you have received a ``/56`` prefix that you can use as you want. Each subnet containing a host must be allocated a ``/64`` subnet. 275/10000 · 275
55 ../../exercises/ipv6.rst:527

	English Configuring IPv6 Networks 25/10000 · 25
56 ../../exercises/ipv6.rst:529

	English With the previous exercises, you have learned how to reason about IPv6 networks "on paper". Given the availability of IPv6 implementations, it is also possible to carry out experiments in real and virtual labs. Several virtual environments are possible. In this section, we focus on mininet_. mininet_ is an emulation framework developed at Stanford University that leverages the namespaces features of recent Linux kernels. With those namespaces, a single Linux kernel can support a variety of routers and hosts interconnected by virtual links. mininet_ has been used by several universities as an educational tool, but unfortunately it was designed without IPv6 support. 672/10000 · 672
57 ../../exercises/ipv6.rst:531

	English During the last years, `Olivier Tilmans <https://inl.info.ucl.ac.be/otilmans.html>`_ and `Mathieu Jadin <https://inl.info.ucl.ac.be/mjadin.html>`_ have developed the missing piece to enable students to use mininet_ to experiment with IPv6: ipmininet_. ipmininet_ is a python module that provides the classes that are required to automatically configure IPv6 networks with different routing protocols. It is available from PyPi from https://pypi.python.org/ipmininet. 467/10000 · 467
58 ../../exercises/ipv6.rst:533

	English The syntax of IPMininet_ is relatively simple and can be learned by looking at a few examples. 94/10000 · 94
59 ../../exercises/ipv6.rst:535

	English Let us start our exploration of IPv6 routing with a simple network topology that contains two hosts and three routers and uses static routes. 141/10000 · 141
60 ../../exercises/ipv6.rst:580

	English IPMininet_ simplifies the creation of the network topology by providing a simple API. For this, you simply need to declare a class that extends the ``IPTopo`` class. 165/10000 · 165
61 ../../exercises/ipv6.rst:592

	English Then, you need to extend the build method that creates routers and hosts. 73/10000 · 73
62 ../../exercises/ipv6.rst:607

	English Although IPMininet_ can assign prefixes and addresses automatically, we use manually assigned addresses in this example. 120/10000 · 120
63 ../../exercises/ipv6.rst:609

	English We use five /64 IPv6 prefixes in this network topology: 55/10000 · 55
64 ../../exercises/ipv6.rst:611

	English ``2001:db8:1341:1::/64`` on the link between ``a`` and ``r1`` 61/10000 · 61
65 ../../exercises/ipv6.rst:612

	English ``2001:db8:1341:12::/64`` on the link between ``r1`` and ``r2`` 63/10000 · 63
66 ../../exercises/ipv6.rst:613

	English ``2001:db8:1341:13::/64`` on the link between ``r1`` and ``r3`` 63/10000 · 63
67 ../../exercises/ipv6.rst:614

	English ``2001:db8:1341:23::/64`` on the link between ``r2`` and ``r3`` 63/10000 · 63
68 ../../exercises/ipv6.rst:615

	English ``2001:db8:1341:1::/64`` on the link between ``b`` and ``r3`` 61/10000 · 61
69 ../../exercises/ipv6.rst:617

	English We can then manually configure the IPv6 addresses of each host/router on each link. Let us start with the links attached to the two hosts. 138/10000 · 138
70 ../../exercises/ipv6.rst:631

	English The same can be done for the three links between the different routers. 71/10000 · 71
71 ../../exercises/ipv6.rst:648

	English With these IP prefixes and the network topology, we can now use IPMininet_ to create the topology and assign the addresses. 123/10000 · 123
72 ../../exercises/ipv6.rst:656

	English We start by creating the objects that correspond to the static routes on the three routers. The second argument of the ``addDaemon`` method is a list of ``StaticRoute`` objects. Each of these objects is created by specifying an IP prefix and a nexthop. 252/10000 · 252
73 ../../exercises/ipv6.rst:675

	English We can now create the hosts and the routers 43/10000 · 43

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