cnp3-ebook/exercises/routing-protocols

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20 ../../exercises/routing-protocols.rst:261

	English The requested information is sent in a `LS Update` packet shortly after that. 77/10000 · 77
21 ../../exercises/routing-protocols.rst:265

	English OSPFv3 also includes `LS Acknowledge` packets that acknowledge the correct reception of link state information. 111/10000 · 111
22 ../../exercises/routing-protocols.rst:269

	English A more detailed discussion of the packets that routing protocols exchange may be found in [Goralski2009]_. 106/10000 · 106
23 ../../exercises/routing-protocols.rst:272

	English Exploring RIP 13/10000 · 13
24 ../../exercises/routing-protocols.rst:274

	English IPMininet_ can also be used to perform experiments with RIP. A simple script that uses RIPng is provided below. 111/10000 · 111
25 ../../exercises/routing-protocols.rst:336

	English As RIP messages are exchanged using UDP on port 521, we filter this port in the tcpdump_ trace. RIPng distributes the routes and our two hosts can exchange packets. The entire script is available from :download:`/exercises/ipmininet_scripts/ripng.py`. 251/10000 · 251
26 ../../exercises/routing-protocols.rst:357

	English We can observe the RIPng messages that are exchanged over the network. :rfc:`2080` defines two types of RIPng messages: 119/10000 · 119
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

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