cnp3-ebook/exercises/routing-protocols

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27 ../../exercises/routing-protocols.rst:359

	English the requests 12/10000 · 12
28 ../../exercises/routing-protocols.rst:360

	English the responses that contain the router's routing table 53/10000 · 53
29 ../../exercises/routing-protocols.rst:362

	English When a router starts, it sends a request message. This is illustrated in the figure below with the first message sent by router ``r2``. This message is sent inside an IPv6 packet whose source address is the link-local address of the router and the destination address is ``ff02::9`` which is the reserved multicast address for RIPng. 333/10000 · 333
30 ../../exercises/routing-protocols.rst:366

	English Router ``r2`` receives a similar request from ``fe80::481a:48ff:fed7:292e`` and replies by sending its routing table in a response message. Note that this message is sent to the link-local address of the requesting router. 222/10000 · 222
31 ../../exercises/routing-protocols.rst:370

	English Later, router ``r2`` will regularly transmit its distance vector inside an unsolicited response message that is sent towards the IPv6 multicast address ``ff02::9``. 164/10000 · 164
32 ../../exercises/routing-protocols.rst:374

	English The packet traces collected on the three routers of this example are available from :download:`/exercises/traces/ripng-r1-trace.pcap`, :download:`/exercises/traces/ripng-r2-trace.pcap` and :download:`/exercises/traces/ripng-r3-trace.pcap`. 239/10000 · 239
33 ../../exercises/routing-protocols.rst:378

	English Exploring BGP 13/10000 · 13
34 ../../exercises/routing-protocols.rst:380

	English To explore the configuration of BGP, let us consider a network that contains three ASes: ``AS1``, ``AS2`` and ``AS3``. To simplify the tests, we identify one host inside each of these ASes. 190/10000 · 190
35 ../../exercises/routing-protocols.rst:434

	English As in the previous examples, we create the routers and associate one IPv6 prefix to each AS: 92/10000 · 92
36 ../../exercises/routing-protocols.rst:436

	English ``AS1`` is assigned ``2001:cafe:1::/48`` 40/10000 · 40
37 ../../exercises/routing-protocols.rst:437

	English ``AS2`` is assigned ``2001:cafe:2::/48`` 40/10000 · 40
38 ../../exercises/routing-protocols.rst:438

	English ``AS3`` is assigned ``2001:cafe:3::/48`` 40/10000 · 40
39 ../../exercises/routing-protocols.rst:454

	English The `addDaemon` method adds a BGP daemon on each router and configures it to advertise the IPv6 prefix allocated to this AS. We then create all the links and manually assign one IPv6 subnet to each link and one IPv6 address to each interface. For the interdomain links, we use an IPv6 prefix that belongs to one of the attached ASes. 333/10000 · 333
40 ../../exercises/routing-protocols.rst:491

	English The last step is to specify to which AS each router belongs and to configure the eBGP sessions and their routing policies. IPMininet_ abstracts most of the complexity of the configuration of these policies by supporting two policies 232/10000 · 232
41 ../../exercises/routing-protocols.rst:510

	English The script ends by launching the full topology. The entire script is available from :download:`/exercises/ipmininet_scripts/ebgp-simple.py`. 140/10000 · 140
42 ../../exercises/routing-protocols.rst:512

	English We can now run this simple network. 35/10000 · 35
43 ../../exercises/routing-protocols.rst:518

	English If you launch the script and immediately type ``ping6all`` to check the connectivity, you might obtained the following result. 126/10000 · 126
44 ../../exercises/routing-protocols.rst:529

	English Remember that BGP is a distributed protocol and that it takes some time to launch the daemons and exchange the messages. After some time, the same command will confirm that everything works as expected. 202/10000 · 202
45 ../../exercises/routing-protocols.rst:540

	English We can also use :manpage:`traceroute6(8)` to check the path followed by the packets. Before doing that, think about the configuration of the BGP routing policies and try to predict the output of :manpage:`traceroute6(8)`. This is a good exercise to check your understanding of BGP. 281/10000 · 281
46 ../../exercises/routing-protocols.rst:542

	English We have configured the following addresses on the hosts. 56/10000 · 56

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