1
00:00:00,210 --> 00:00:07,350
Neighbor Discovery Protocol or NDP has a number of functions with regards to IP version six.

2
00:00:07,500 --> 00:00:12,870
The first one is Slack, which again is stateless address order configuration.

3
00:00:13,320 --> 00:00:18,600
A host can discover which subnet or prefix it belongs to.

4
00:00:19,170 --> 00:00:26,460
A host or PC, as an example, could use its Mac address for the host portion of an IP version six address,

5
00:00:26,460 --> 00:00:32,910
but it needs to know which subnet it belongs to or which prefix it belongs to, and the length of that

6
00:00:32,910 --> 00:00:33,840
prefix.

7
00:00:34,170 --> 00:00:41,340
A router can dynamically allocate the network portion of the address to a host using Slack, and I'm

8
00:00:41,340 --> 00:00:43,500
going to demonstrate that in a moment.

9
00:00:43,950 --> 00:00:48,630
Router Discovery is how IP Version six hosts discover routers.

10
00:00:48,630 --> 00:00:54,960
So Router Discovery would be used by a host to determine the subnet that it belongs to.

11
00:00:55,530 --> 00:01:00,480
The host again needs to determine the network portion of an address and it can use router discovery

12
00:01:00,480 --> 00:01:02,040
messages to do that.

13
00:01:02,310 --> 00:01:09,480
Duplicate address translation or D&D is used by a host to determine that no other host is using the

14
00:01:09,480 --> 00:01:10,830
same IP address.

15
00:01:11,160 --> 00:01:18,300
We don't want to have duplicate addresses if by some reason there are two hosts on the same subnet using

16
00:01:18,300 --> 00:01:19,500
the same MAC address.

17
00:01:19,500 --> 00:01:25,050
Duplicate address detection can be used to determine if there are duplicate addresses.

18
00:01:25,530 --> 00:01:33,210
An IP version six PC will first check whether another host is using the same IP version six a unicast

19
00:01:33,210 --> 00:01:38,310
address as itself before it tries to use that address.

20
00:01:39,050 --> 00:01:44,840
In addition, neighbor discovery protocol is used for neighbor Mac Discovery.

21
00:01:44,900 --> 00:01:48,170
There's no ARP messages in IP version six.

22
00:01:48,740 --> 00:01:50,700
ARP uses broadcasts.

23
00:01:50,720 --> 00:01:53,540
Broadcasts are not supported and IP version six.

24
00:01:53,690 --> 00:01:56,870
So a different mechanism is required.

25
00:01:57,610 --> 00:02:03,880
And again, neighbor discovery protocol is used to discover neighboring Mac addresses.

26
00:02:04,480 --> 00:02:10,750
If a PC needs to ping another device on the same subnet, it needs to know what the Mac address is of

27
00:02:10,750 --> 00:02:12,610
that neighboring device.

28
00:02:12,610 --> 00:02:16,960
So it determines the MAC address through neighbor Mac Discovery.

29
00:02:16,990 --> 00:02:20,860
NDP replaces IP version for ARP.

30
00:02:21,660 --> 00:02:26,130
So how do you IPV six hosts discover routers?

31
00:02:26,460 --> 00:02:31,440
ICMP Version six replaces IP version for ICMP.

32
00:02:32,120 --> 00:02:35,450
Again, there's a lot of similarity between the protocols.

33
00:02:35,480 --> 00:02:43,430
IP Version six ICMP supports echo requests and echo replies, so you can use pings in the same way as

34
00:02:43,430 --> 00:02:45,110
you did an IP version for.