1
00:00:00,870 --> 00:00:08,730
IP version six link local addresses are unicast addresses but restricted to the local link, hence the

2
00:00:08,730 --> 00:00:09,990
name link local.

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00:00:10,800 --> 00:00:13,010
They are still 128 bits in length.

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00:00:13,020 --> 00:00:17,670
The interface identifies automatically configured with the UI address.

5
00:00:18,740 --> 00:00:27,050
Note, however, that the most significant ten bits of the address start with F 80 in hexadecimal or

6
00:00:27,050 --> 00:00:33,320
seven binary ones followed by binary zero followed by binary one followed by binary zero in binary.

7
00:00:34,350 --> 00:00:39,060
Routing protocols, use link local addresses to advertise routes to one another.

8
00:00:39,300 --> 00:00:46,200
And in IP version six, a node having a global unicast address on a local link will use the link local

9
00:00:46,200 --> 00:00:51,420
address of its default IPV six router rather than the global unicast address.

10
00:00:52,020 --> 00:00:57,600
This is good because if the network is renumbered, the default router can still be used using the link

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00:00:57,600 --> 00:00:58,590
local address.

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00:00:59,680 --> 00:01:05,260
Linked local addresses won't change when you remember your global unicast addresses.

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00:01:06,860 --> 00:01:08,330
Site local addresses.

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00:01:09,290 --> 00:01:15,170
Also another type of unicast address but have a limited scope to a site site.

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00:01:15,170 --> 00:01:20,870
Local addresses are not enabled by default on nodes, unlike linked local addresses, which are automatically

16
00:01:20,870 --> 00:01:21,530
enabled.

17
00:01:21,530 --> 00:01:24,560
In other words, you have to configure site local addresses.

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00:01:25,530 --> 00:01:32,490
The address starts with FEC zero, with the most significant ten bits set in binary to seven binary

19
00:01:32,490 --> 00:01:35,970
ones followed by binary zero followed by two binary ones.

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00:01:36,880 --> 00:01:44,290
So the most significant ten bits of a psychological address always starts with this value site.

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00:01:44,290 --> 00:01:49,990
Local addresses are the IP version six equivalent of RFC 1918 addresses.

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00:01:50,080 --> 00:01:54,220
These, however, have been deprecated and should no longer be used.

23
00:01:55,270 --> 00:02:02,320
But the idea was that you could have many, many subnets within your organisation as you would now have

24
00:02:02,320 --> 00:02:04,930
54 bits for submitting.

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00:02:05,680 --> 00:02:11,350
Which is far greater than the 16 bits that you get with global unicast addresses.

26
00:02:12,490 --> 00:02:18,100
The next type of address is an IPv4 compatible IPv6 address.

27
00:02:18,670 --> 00:02:26,410
In this address, the most significant 96 bits are set to zero, and the least significant 32 bits are

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00:02:26,410 --> 00:02:28,390
set to the IP version for address.

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00:02:29,620 --> 00:02:36,970
This is a special, unique cost IPv6 address used as a transmission mechanism on hosts and routers to

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00:02:36,970 --> 00:02:44,380
automatically create IPV four tunnels to deliver IPV six packets over IPV four networks.

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00:02:44,680 --> 00:02:52,690
This mechanism allows for the automatic establishment of an IPV six over IPV four tunnel between two

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00:02:52,690 --> 00:03:02,140
nodes over an IPv4 infrastructure using the IP version for destination address inside the destination

33
00:03:02,140 --> 00:03:03,580
IPV six address.

34
00:03:04,840 --> 00:03:10,780
So the format of the address would be as follows The most significant 96 bits would be set to zero.

35
00:03:12,010 --> 00:03:18,970
The least significant 32 bits would be set to the decimal representation of the IP version for address

36
00:03:19,630 --> 00:03:21,430
that could be rewritten as follows.

37
00:03:21,430 --> 00:03:22,150
So colon.

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00:03:22,150 --> 00:03:25,240
Colon 19202 100.

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00:03:26,140 --> 00:03:30,400
The decimal IP version for address could also be written as a hexadecimal value.

40
00:03:30,760 --> 00:03:32,680
So this would be the same address.

41
00:03:34,220 --> 00:03:41,930
For example, 192 in decimal is equal to c zero in hexadecimal.

42
00:03:42,500 --> 00:03:46,010
Notice one two equates to C zero.

43
00:03:47,000 --> 00:03:53,720
So once again, it's used to represent the addresses of IP version four nodes as IP version six addresses.

44
00:03:53,840 --> 00:04:00,530
But please note that this address format has been deprecated in favor of other more enhanced transition

45
00:04:00,530 --> 00:04:06,770
mechanisms such as dynamic net P RT or net protocol translation.

46
00:04:07,550 --> 00:04:17,000
It's also important to point out that the IPv4 compatible IPv6 addresses use a slash 96 mask, so 96

47
00:04:17,000 --> 00:04:19,100
bits are set to zero.

48
00:04:19,490 --> 00:04:21,410
The mask is slash 96.

49
00:04:22,100 --> 00:04:28,520
The least significant 32 bits are set to the IP version for address, either in dotted decimal notation

50
00:04:28,520 --> 00:04:34,970
such as here or a hexadecimal representation of the address like in this example.

51
00:04:36,530 --> 00:04:42,200
As I've already mentioned, unspecified addresses is where the address is set to zeros, and it's used

52
00:04:42,200 --> 00:04:44,690
as a placeholder where no address is available.

53
00:04:44,690 --> 00:04:50,300
So during an initial DHCP request or duplicate address detection.

54
00:04:51,460 --> 00:04:53,410
Loopback addresses are set to zeros.

55
00:04:53,710 --> 00:04:55,180
And lastly, a one.

56
00:04:55,360 --> 00:05:02,410
This is equivalent to 120 7001 an IP version four and is used by the host to identify itself.

57
00:05:02,890 --> 00:05:04,330
I've already demonstrated this.

58
00:05:05,080 --> 00:05:10,030
And can be used to check that the IPv6 protocol stack is functioning properly.

59
00:05:11,960 --> 00:05:19,340
So in summary, IPV six unicast addresses can be broken up into six types.

60
00:05:19,370 --> 00:05:21,380
The first type is unspecified.

61
00:05:21,380 --> 00:05:28,100
So colon, colon slash 128, then loopback colon colon one, slash 128.

62
00:05:29,090 --> 00:05:34,910
And then we have aggregated all global unicast addresses and yes, some examples of ranges.

63
00:05:35,780 --> 00:05:38,120
These, remember, are globally unique.

64
00:05:38,660 --> 00:05:40,220
There is no need for net.

65
00:05:41,160 --> 00:05:42,930
Because you have global reach ability.

66
00:05:42,930 --> 00:05:45,180
That address is unique globally.

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00:05:45,570 --> 00:05:51,030
Then we have linked local addresses, which are addresses used only on the local link, used for example

68
00:05:51,030 --> 00:05:52,260
by routing protocols.

69
00:05:52,560 --> 00:05:54,150
Starts with F 80.

70
00:05:55,130 --> 00:05:56,360
In hexadecimal.

71
00:05:56,960 --> 00:06:02,570
Site local addresses are similar in concept to RFC 1918 private addresses.

72
00:06:03,020 --> 00:06:05,660
They start with fec0.

73
00:06:06,910 --> 00:06:11,290
IPV four compatible addresses the most significant 96 bits.

74
00:06:12,110 --> 00:06:13,550
Ossett set to zero.

75
00:06:13,700 --> 00:06:19,370
And this allowed us to create automatic tunneling of IPV six over IPV four.

76
00:06:19,580 --> 00:06:24,320
Both site local and IPV four compatible addresses have been deprecated.

77
00:06:25,580 --> 00:06:31,790
Now multicast addresses are broken up into two parts f008.

78
00:06:32,790 --> 00:06:40,590
I signed multicast addresses and then you have solicited node multicast addresses for each unicast and

79
00:06:40,590 --> 00:06:43,980
any cost address configured on an interface of a node or router.

80
00:06:44,010 --> 00:06:50,130
A corresponding solicited node multicast addresses automatically enabled the solicited node.

81
00:06:50,130 --> 00:06:54,180
Multicast address is scoped to the local link.

82
00:06:54,920 --> 00:07:03,020
This is an example is used for the replacement of OP in IP version for if you remember, OP uses broadcasts,

83
00:07:03,410 --> 00:07:06,740
but broadcasts are no longer supported in IP version six.

84
00:07:07,470 --> 00:07:13,350
So the solicited node multicast address is used by nodes and routers to learn the link layer addresses

85
00:07:13,350 --> 00:07:16,230
of neighbor nodes and routers on the same link.

86
00:07:17,100 --> 00:07:23,010
So very similar in concept to OP, but we are not using broad costs, we're using multi costs.

87
00:07:23,700 --> 00:07:30,060
Duplicate address detection or D&D can be used by a node to verify whether an IPV six address is already

88
00:07:30,060 --> 00:07:37,380
in use on its local link before using that address to configure its own IPV six address with stateless

89
00:07:37,380 --> 00:07:38,610
order configuration.

90
00:07:41,220 --> 00:07:46,860
Stateless order configuration is a new function enabled by IP version six.

91
00:07:48,840 --> 00:07:50,850
By having a much larger dress space.

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00:07:50,850 --> 00:07:58,230
IP Version six is designed to enable order configuration of IP addresses on devices while keeping those

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00:07:58,230 --> 00:07:59,460
addresses unique.

94
00:08:00,090 --> 00:08:08,740
This enables basic serverless configuration of nodes as well as easy re numbering routers.

95
00:08:08,740 --> 00:08:13,440
Send periodic router advertisements using a link local address.

96
00:08:14,160 --> 00:08:20,640
I wouldn't try and remember these addresses, but the address used would be this, but the source address

97
00:08:20,640 --> 00:08:21,840
used would be this.

98
00:08:22,320 --> 00:08:25,230
Going to a multicast address of f02.

99
00:08:25,230 --> 00:08:26,520
Colon colon one.

100
00:08:26,550 --> 00:08:34,409
In other words, all nodes on the link the routing uses ICMP version six Type 134, which is known as

101
00:08:34,409 --> 00:08:39,510
a right advertisement, telling nodes information like what prefix to use.

102
00:08:40,179 --> 00:08:46,000
What the default gateway is and the lifetime of this prefix that's advertised to them.

103
00:08:46,870 --> 00:08:49,030
The advertisement period can vary.

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00:08:49,870 --> 00:08:54,250
And you can also change the lifetime of the prefix advertised to hosts.

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00:08:56,350 --> 00:09:03,340
When our host initially boots up the node will need its IP address as soon as possible and normally

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00:09:03,340 --> 00:09:09,820
in the early stages of the boot process, it could wait for a long period of time for the next router

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00:09:09,820 --> 00:09:14,320
advertisement to get the information it needs to configure its interfaces.

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00:09:14,650 --> 00:09:21,340
And thus a node will send a write a solicitation message to routers on the network, asking them to

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00:09:21,340 --> 00:09:27,700
reply immediately with a router advertisement so that the node can immediately order configure its IP

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00:09:27,700 --> 00:09:28,300
address.

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00:09:30,050 --> 00:09:35,720
So the host will send a writer solicitation to all writers using the all writers multicast address f

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00:09:35,810 --> 00:09:39,680
zero to colon colon to the host users.

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00:09:39,680 --> 00:09:42,740
ICMP Version six Type 133.

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00:09:42,890 --> 00:09:46,040
Again, I wouldn't try and remember all of these ICMP types.

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00:09:46,070 --> 00:09:47,840
Just understand the process.

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00:09:48,710 --> 00:09:55,280
The host uses its link local address as the source of the solicitation request.

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00:09:55,430 --> 00:10:00,380
So it uses F 80, followed by its UI address as the source.

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And the message goes to destination of F zero to colon.

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00:10:03,920 --> 00:10:06,470
Colon to all routers on the local link.

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Arata will reply to that message.

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Using ICMP version six Type 134.

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The writer will use its link local address of F 80 and UI as the source, and the destination will go

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00:10:21,020 --> 00:10:23,190
to f02 colon column one.

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In other words, all nodes on the link.

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00:10:25,700 --> 00:10:32,960
So order configuration has the advantage in that it enables plug and play configuration of IPV six devices.

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00:10:33,530 --> 00:10:40,130
You just configure an IP address on the router and by default, router advertisements are enabled.

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00:10:41,390 --> 00:10:48,020
PCs and other devices can be plugged into the network and they will automatically learn the prefix assigned

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00:10:48,020 --> 00:10:50,330
to them and default gateway.

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00:10:50,330 --> 00:10:57,050
Without the administrator configuring a DHCP server or manually configuring IP addresses, hosts are

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00:10:57,050 --> 00:11:02,630
automatically configured with the prefix received and then they combine that with their link layer address.

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00:11:02,660 --> 00:11:09,230
In other words, the UI address to configure a local IPV six address to allow them to communicate with

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00:11:09,230 --> 00:11:10,040
the network.

133
00:11:11,240 --> 00:11:17,960
Another advantage of stateless auto configuration is the re numbering of devices erotic and just advertise

134
00:11:17,960 --> 00:11:26,060
a new prefix and time out the old prefix if required, and hosts will automatically be updated with

135
00:11:26,060 --> 00:11:27,770
the new prefix information.

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00:11:28,310 --> 00:11:34,610
So gone are the days of struggling to reconfigure and remember the IP addresses of hosts.

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00:11:35,990 --> 00:11:41,540
Now stateful DHCP still exists in version six of DHCP.

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It provides more control than stateless auto configuration.

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00:11:46,130 --> 00:11:53,990
For example, if using Cisco IP phones, they need to learn an option 150 from a DHCP server which tells

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00:11:53,990 --> 00:12:00,020
the phone's the TFTP server they need to connect to you to download their configuration as well as their

141
00:12:00,020 --> 00:12:00,740
firmware.

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00:12:01,490 --> 00:12:07,880
So DHCP in some cases is still required as it gives us more control and more options.

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00:12:08,640 --> 00:12:16,410
Now that said, you can use stateful DHCP concurrently with stateless order configuration so you don't

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00:12:16,410 --> 00:12:18,930
have to make an explicit choice between the two.

145
00:12:19,810 --> 00:12:20,320
Stateful.

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00:12:20,320 --> 00:12:24,280
The app can also provide IP version six addresses and the absence of routers.

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00:12:24,550 --> 00:12:29,710
So in this topology there are no routers, so DHCP server can be configured.

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00:12:30,250 --> 00:12:36,640
It can also be used for network remembering in the same way as in IP version four and it can be used

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00:12:36,640 --> 00:12:41,050
for automatic domain name registration of hosts using dynamic DNS.

150
00:12:41,170 --> 00:12:46,180
So a lot of the concepts available in IP version four also apply in IP version six.

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00:12:47,220 --> 00:12:51,000
Now in this example we have both errata and a DHCP server.

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00:12:52,320 --> 00:12:57,720
Now the process for acquiring configuration data for a DHCP version six client is very similar to IP

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00:12:57,720 --> 00:12:58,590
version four.

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00:12:58,620 --> 00:13:05,730
However, initially, the client will first detect the presence of routers on the link by using neighbor

155
00:13:05,730 --> 00:13:07,080
discovery messages.

156
00:13:07,410 --> 00:13:09,000
If at least one router is found.

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00:13:09,000 --> 00:13:14,790
As in this diagram, the client will examine the router advertisements to determine if DHCP version

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00:13:14,790 --> 00:13:15,960
six should be used.

159
00:13:16,560 --> 00:13:22,080
If there are advertisements, enable the use of DHCP version six on the link or if there's no router,

160
00:13:22,110 --> 00:13:27,030
the client then starts a DHCP solicit phase to find a DHCP server.

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00:13:27,990 --> 00:13:35,520
So in this example, dhcp version six can be used so the host will send a DHCP solicit message to DHCP

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00:13:35,520 --> 00:13:36,930
version six agents.

163
00:13:37,170 --> 00:13:41,670
In other words, dhcp servers using multicast address ff02.

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00:13:41,670 --> 00:13:42,780
Colon colon one.

165
00:13:42,780 --> 00:13:43,650
Colon two.

166
00:13:44,340 --> 00:13:49,020
Once again, just remember anything starting with ff02 is a multicast address.

167
00:13:49,940 --> 00:13:53,420
We do not have broadcasts in IP version six.

168
00:13:53,930 --> 00:13:58,130
So in the place of broadcasts, we're using specific multicast addresses.

169
00:13:59,480 --> 00:14:02,240
The hosts will use a source address of F 80.

170
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In other words, a link local address.

171
00:14:06,010 --> 00:14:13,930
Now both DHCP servers and DHCP relays will listen for DHCP solicit messages on this multicast address.

172
00:14:14,290 --> 00:14:20,080
So DHCP forwarding is very similar in IP version six as it's in IP version four.

173
00:14:21,340 --> 00:14:29,590
Now, if the app cannot be used, the host reverts to stateless configuration as per the previous examples

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00:14:29,590 --> 00:14:30,430
I've shown you.

175
00:14:31,120 --> 00:14:35,080
Now, without further ado, let's set up a basic IP version six network.

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00:14:35,470 --> 00:14:39,010
In this example, I have router one and router two.

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00:14:39,780 --> 00:14:42,540
Both routers have a fast Ethernet interface.

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00:14:42,540 --> 00:14:47,040
Rather, one's network on the foster ethernet interface is going to be 2001 colon.

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00:14:47,040 --> 00:14:54,210
One colon, one colon, one router two's FOSS Ethernet subnet is going to be 2001 colon one colon one

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00:14:54,210 --> 00:14:55,140
colon three.

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00:14:55,800 --> 00:15:02,040
The routers are connected via serial link and the subnet here is going to be 2001 colon, one colon,

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00:15:02,040 --> 00:15:04,290
one colon to notice.

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00:15:04,290 --> 00:15:09,120
Once again, the subnet mask is always slash 64 on all subnets.

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00:15:09,980 --> 00:15:10,280
Okay.

185
00:15:10,280 --> 00:15:14,750
So on router one, I'm going to break out of the initial configuration dialog.

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00:15:19,500 --> 00:15:23,190
Go into global config mode and give the writer a name.

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00:15:24,000 --> 00:15:29,700
And then I'm going to enable IPV six unicast routing.

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00:15:33,080 --> 00:15:35,270
So that we can run IPv6 on this router.

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00:15:37,100 --> 00:15:45,080
And then I'm going to go on to f00, the first Ethernet interface and give it an address or IPV six.

190
00:15:45,320 --> 00:15:50,540
And notice there are a lot of options here, but I'm going to specify address and then I'm going to

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00:15:50,540 --> 00:15:53,570
specify an IPV six address.

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00:15:55,280 --> 00:15:56,720
So 2001.

193
00:16:00,110 --> 00:16:07,040
And in this case, I'm going to give the interface and address of one.

194
00:16:09,670 --> 00:16:14,320
So it's as simple as that to configure an IP version six address on a router.

195
00:16:15,620 --> 00:16:19,100
This portion is the network portion.

196
00:16:19,460 --> 00:16:21,200
And notice we've got colon.

197
00:16:21,200 --> 00:16:22,130
Colon.

198
00:16:22,280 --> 00:16:25,070
So there are a bunch of zeros not displayed here.

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00:16:25,970 --> 00:16:27,560
And we ending in a one.

200
00:16:29,560 --> 00:16:30,300
And then I can know.

201
00:16:30,310 --> 00:16:31,420
Shut the interface.

202
00:16:35,730 --> 00:16:37,690
And as you can see, the interface has come up.

203
00:16:37,710 --> 00:16:41,910
So now I can do Ping 2001.

204
00:16:45,790 --> 00:16:47,220
And ping the IP address.

205
00:16:47,230 --> 00:16:52,930
And as you can see, the ping is successful on the serial zero interface.

206
00:16:52,930 --> 00:16:54,210
I can do the same thing.

207
00:16:54,220 --> 00:16:55,420
IPV six.

208
00:16:56,680 --> 00:16:58,930
Address 2001.

209
00:17:02,590 --> 00:17:02,770
Okay.

210
00:17:04,599 --> 00:17:07,750
And on this side, I'm giving it an address of colon one.

211
00:17:07,869 --> 00:17:10,660
And on this side, I'm going to give it an address of Colon two.

212
00:17:11,230 --> 00:17:16,300
So in order to do the same thing, enable IPV six unicast routing.

213
00:17:17,079 --> 00:17:24,190
And then on f00, give it an IPV six address of 2001.

214
00:17:30,330 --> 00:17:30,570
No.

215
00:17:30,570 --> 00:17:33,630
Shut the interface and serial zero zero.

216
00:17:33,660 --> 00:17:34,830
Give it an address.

217
00:17:41,890 --> 00:17:43,420
And I shot that interface.

218
00:17:49,110 --> 00:17:53,640
So hopefully now from router to I should be able to ping router one.

219
00:18:03,340 --> 00:18:05,370
That doesn't work because I forgot to know.

220
00:18:05,410 --> 00:18:06,820
Shut the interface on the side so I'll.

221
00:18:06,820 --> 00:18:07,600
No, shut it.

222
00:18:09,110 --> 00:18:10,790
And go back to Rada, too.

223
00:18:11,270 --> 00:18:13,580
And let's see if the ping succeeds this time.

224
00:18:15,960 --> 00:18:19,500
Cat interface came up and as you can see, the ping succeeded.

225
00:18:20,310 --> 00:18:24,780
It's as simple as that to configure IP addresses on a Cisco router.

226
00:18:25,660 --> 00:18:31,720
Now on the fast Ethernet interface, I could give it another IP address so I could say IPv6 address.

227
00:18:32,210 --> 00:18:33,310
Let's just be lazy.

228
00:18:33,880 --> 00:18:36,910
Let's give it an address of 2001.

229
00:18:36,910 --> 00:18:39,070
Colon, colon one slash 64.

230
00:18:39,790 --> 00:18:41,470
And as you can see, the right is accepted.

231
00:18:41,470 --> 00:18:46,930
That address on the right, I could not ping 2001 colon colon one.

232
00:18:47,620 --> 00:18:49,480
And as you can see, the ping succeeds.

233
00:18:49,900 --> 00:18:56,860
I could go back onto the interface and give it an address as follows IPV six address and let's say 2001

234
00:18:57,280 --> 00:18:59,020
colon to colon.

235
00:18:59,020 --> 00:19:03,310
Colon notice it gives you the option of link local address, but we don't want to do that.

236
00:19:03,310 --> 00:19:07,120
Let's go for slash 64 notice, please.

237
00:19:07,120 --> 00:19:08,410
I haven't put.

238
00:19:10,200 --> 00:19:11,850
A host portion on this address.

239
00:19:11,850 --> 00:19:14,100
I've just specified the network portion.

240
00:19:14,550 --> 00:19:19,440
And now what I can do is I can specify UI 64 and hit enter.

241
00:19:20,070 --> 00:19:23,190
So we're going to use the MAC address as part of that address.

242
00:19:23,610 --> 00:19:29,880
So now I can type the command show run interface if zero zero to show you the configuration.

243
00:19:30,480 --> 00:19:34,710
And as you can see, there's no IP version for address configured on this interface.

244
00:19:34,980 --> 00:19:41,100
There are only IP version six addresses and they are three IP version six addresses that we have manually

245
00:19:41,100 --> 00:19:41,940
configured.

246
00:19:44,150 --> 00:19:50,000
I could then tap show interface if 0/0 the Mac address of this interface.

247
00:19:51,340 --> 00:19:57,070
You see 4010fe8 followed by four zeros.

248
00:19:57,640 --> 00:20:05,470
So the vendor portion of this address is c4010f and the unique portion is E eight, followed by four

249
00:20:05,470 --> 00:20:06,220
zeros.

250
00:20:06,490 --> 00:20:14,080
So just to display that nicely, I'm going to say show interface if zero zero type include a.

251
00:20:14,110 --> 00:20:16,270
So it only shows that MAC address.

252
00:20:17,240 --> 00:20:17,990
In the output.

253
00:20:17,990 --> 00:20:18,890
And there it is.

254
00:20:20,440 --> 00:20:21,770
And then I'm going to top show.

255
00:20:21,790 --> 00:20:29,680
IPV six interface if zero zero and only include the addresses that we configured.

256
00:20:30,660 --> 00:20:34,290
And they are the three IP addresses we configured on the interface.

257
00:20:34,860 --> 00:20:35,460
So notice.

258
00:20:35,460 --> 00:20:36,270
Yes, please.

259
00:20:37,390 --> 00:20:38,830
We'll start from the right hand side.

260
00:20:39,340 --> 00:20:42,940
The unique portion of the Mac address is E eight, followed by four zeros.

261
00:20:43,800 --> 00:20:45,960
There it is in the IP address.

262
00:20:45,960 --> 00:20:48,450
Remember, leading zeros can be dropped.

263
00:20:48,570 --> 00:20:53,310
So this zero here represents those four zeros e eight.

264
00:20:54,240 --> 00:20:55,770
Is the eat over there.

265
00:20:57,020 --> 00:21:04,520
If if e has been inserted in the address to make it 64 bits and then notice the remaining portion is

266
00:21:04,520 --> 00:21:06,830
c4010f.

267
00:21:08,700 --> 00:21:13,940
Which is represented here as c601f.

268
00:21:14,310 --> 00:21:17,100
Once again, leading zeros can be removed.

269
00:21:17,370 --> 00:21:20,070
Notice the zero in front of this f has been removed.

270
00:21:22,510 --> 00:21:35,110
Si 401 has been converted to c601 because the seventh bit has been changed to a one to represent that

271
00:21:35,110 --> 00:21:37,300
this Mac address is globally unique.

272
00:21:39,420 --> 00:21:42,300
So notice a IP address.

273
00:21:43,430 --> 00:21:44,630
Is derived.

274
00:21:45,330 --> 00:21:51,240
From the Mac address by using the UI representation of the MAC address.

275
00:21:54,210 --> 00:22:00,190
Let's talk the command show, IPV six interface.

276
00:22:00,210 --> 00:22:01,620
If 0/0.

277
00:22:02,910 --> 00:22:10,440
And as you'll see here, notice there are three globally unique unicast addresses configured on the

278
00:22:10,440 --> 00:22:11,280
interface.

279
00:22:12,770 --> 00:22:14,120
Notice on this interface.

280
00:22:14,120 --> 00:22:22,880
IPV six is enabled and there our link local address starting with feed and the UI portion of the address.

281
00:22:24,840 --> 00:22:26,460
f02 Colon.

282
00:22:26,460 --> 00:22:29,910
Colon one represents all nodes and routers on the link.

283
00:22:31,390 --> 00:22:34,030
If zero to colon.

284
00:22:34,030 --> 00:22:37,390
Colon two represents all routers on the link.

285
00:22:38,440 --> 00:22:43,840
This is the solicited node multicast address used for mechanisms that replace OP.

286
00:22:43,870 --> 00:22:48,010
In other words, this is the address used by duplicate address detection.

287
00:22:48,010 --> 00:22:48,970
Or Dad.

288
00:22:49,600 --> 00:22:55,990
There's a solicited node multicast address for each unique link ID.

289
00:22:57,170 --> 00:23:05,720
So solicited node multicast addresses consist of f zero to colon colon one, colon f f and then the

290
00:23:05,720 --> 00:23:09,080
unique portion of the interface ID.

291
00:23:09,500 --> 00:23:12,740
So as an example, you can see this is 001.

292
00:23:13,630 --> 00:23:16,990
Which is the same for this address and this address.

293
00:23:17,940 --> 00:23:20,400
But yeah, notice we have f02 colon.

294
00:23:20,400 --> 00:23:24,360
Colon one colon ffe80.

295
00:23:25,500 --> 00:23:29,940
Because of this entry here, which is different to the previous addresses.