cnp3-ebook/protocols/ipv6 — English @ Weblate

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27 ../../protocols/ipv6.rst:113

	English ``abcd:ef01:2345:6789:abcd:ef01:2345:6789`` 43/10000 · 43
28 ../../protocols/ipv6.rst:114

	English ``2001:db8:0:0:8:800:200c:417a`` 32/10000 · 32
29 ../../protocols/ipv6.rst:115

	English ``fe80:0:0:0:219:e3ff:fed7:1204`` 33/10000 · 33
30 ../../protocols/ipv6.rst:117

	English IPv6 addresses often contain a long sequence of bits set to ``0``. In this case, a compact notation has been defined. With this notation, `::` is used to indicate one or more groups of 16 bits blocks containing only bits set to `0`. For example, 245/10000 · 245
31 ../../protocols/ipv6.rst:119

	English ``2001:db8:0:0:8:800:200c:417a`` is represented as ``2001:db8::8:800:200c:417a`` 82/10000 · 82
32 ../../protocols/ipv6.rst:120

	English ``ff01:0:0:0:0:0:0:101`` is represented as ``ff01::101`` 58/10000 · 58
33 ../../protocols/ipv6.rst:121

	English ``0:0:0:0:0:0:0:1`` is represented as ``::1`` 45/10000 · 45
34 ../../protocols/ipv6.rst:122

	English ``0:0:0:0:0:0:0:0`` is represented as ``::`` 44/10000 · 44
35 ../../protocols/ipv6.rst:124

	English An IPv6 prefix can be represented as `address/length`, where `length` is the length of the prefix in bits. For example, the three notations below correspond to the same IPv6 prefix : 182/10000 · 182
36 ../../protocols/ipv6.rst:126

	English ``2001:0db8:0000:cd30:0000:0000:0000:0000`` / ``60`` 52/10000 · 52
37 ../../protocols/ipv6.rst:127

	English ``2001:0db8::cd30:0:0:0:0`` / ``60`` 36/10000 · 36
38 ../../protocols/ipv6.rst:128

	English ``2001:0db8:0:cd30::`` / ``60`` 31/10000 · 31
39 ../../protocols/ipv6.rst:130

	English IPv6 supports unicast, multicast and anycast addresses. An IPv6 unicast address is used to identify one datalink-layer interface on a host. If a host has several datalink layer interfaces (e.g. an Ethernet interface and a WiFi interface), then it needs several IPv6 addresses. In general, an IPv6 unicast address is structured as shown in the figure below. 356/10000 · 356
40 ../../protocols/ipv6.rst:153

	English An IPv6 unicast address is composed of three parts : 52/10000 · 52
41 ../../protocols/ipv6.rst:155

	English A `global routing prefix` that is assigned to the Internet Service Provider that owns this block of addresses 109/10000 · 109
42 ../../protocols/ipv6.rst:156

	English A `subnet identifier` that identifies a customer of the ISP 59/10000 · 59
43 ../../protocols/ipv6.rst:157

	English An `interface identifier` that identifies a particular interface on a host 74/10000 · 74
44 ../../protocols/ipv6.rst:159

	English The subnet identifier plays a key role in the scalability of network layer addressing architecture. An important point to be defined in a network layer protocol is the allocation of the network layer addresses. A naive allocation scheme would be to provide an address to each host when the host is attached to the Internet on a first come first served basis. With this solution, a host in Belgium could have address ``2001:db8::1`` while another host located in Africa would use address ``2001:db8::2``. Unfortunately, this would force all routers on the Internet to maintain one route towards each host. In the network layer, scalability is often a function of the number of routes stored on the router. A network will usually work better if its routers store fewer routes and network administrators usually try to minimize the number of routes that are known by their routers. For this, they often divide their network prefix in smaller blocks. For example, consider a company with three campuses, a large one and two smaller ones. The network administrator would probably divide his block of addresses as follows : 1117/10000 · 1117
45 ../../protocols/ipv6.rst:161

	English the bottom half is used for the large campus 44/10000 · 44
46 ../../protocols/ipv6.rst:162

	English the top half is divided in two smaller blocks, one for each small campus 72/10000 · 72

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