1
00:00:00,560 --> 00:00:00,890
Now.

2
00:00:00,890 --> 00:00:08,150
ICMP version six also includes neighbor discovery protocol messages and the two of interest here are

3
00:00:08,150 --> 00:00:16,580
router solicitation or RC and router advertisement or a so router solicitation message is sent to all

4
00:00:16,580 --> 00:00:18,320
IP version six routers.

5
00:00:18,920 --> 00:00:26,810
In other words, if zero two Colon Colon two routers on the local segment will be subscribed to that

6
00:00:26,810 --> 00:00:31,670
multicast address and they will reply back with router advertisements.

7
00:00:32,299 --> 00:00:37,880
So what advertisements are sent by routers and include information such as the link local IP version

8
00:00:37,880 --> 00:00:45,170
six address of the router and the local segment routers advertise themselves using multicast address

9
00:00:45,200 --> 00:00:50,570
for zero two Colon Colon one, which is all devices on the local segment.

10
00:00:51,050 --> 00:00:58,730
A host is an example will boot up and send a message to four zero to Colon Colon two to ask all routers

11
00:00:58,730 --> 00:01:00,320
to identify themselves.

12
00:01:00,680 --> 00:01:04,910
The routers will then reply back with their link local address.

13
00:01:05,300 --> 00:01:13,010
Routers also send unsolicited rather advertisement messages, so on a periodic basis they will advertise

14
00:01:13,010 --> 00:01:19,880
their details on the IP version six link and they send that again to 402 colon.

15
00:01:19,880 --> 00:01:20,810
Colon one.

16
00:01:21,510 --> 00:01:27,990
Now by leveraging neighbor discovery protocol or rather solicitation and errata advertisement messages

17
00:01:27,990 --> 00:01:31,140
hosts can discover which subnet they belong to.

18
00:01:31,500 --> 00:01:40,650
So routers by using Slack can advertise the local prefix and length to hosts on the local segment.

19
00:01:41,070 --> 00:01:43,110
So let's have a look at that practically.