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Neighbor Discovery Protocol or NDP has a number of functions with regards to IP version 6.

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The first one is slack which again is stateless address order configuration.

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A host can discover which subnet or prefix it belongs to a host or P.C. as an example could use its

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MAC address for the host portion of an IP version 6 address.

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But it needs to know which subnet it belongs to or which prefix it belongs to and the length of that

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prefix a router can dynamically allocate the network portion of the address to a host using Slack.

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And I'm going to demonstrate that in a moment.

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Rather discovery is how IP version 6 hosts discover routers.

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So rather discovery would be used by a host to determine the subnet that it belongs to the host again

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needs to determine the network portion of an address and it can use rather discovery messages to do

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that duplicate address translation or dad is used by a host to determine that no other host is using

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the same IP address.

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We don't want to have duplicate addresses.

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If by some reason there are two hosts on the same subnet using the same MAC address duplicate address

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detection can be used to determine if there are duplicate addresses an IP version 6 P.C. will first

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check whether another host is using the same IP version 6 a unique cost address as itself before it

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tries to use that address in addition neighbor Discovery Protocol is used for neighbor Mac discovery

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there's no up messages in IP version 6 OP uses broadcasts broadcasts are not supported an IP version

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6 so a different mechanism is required.

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And again maybe Discovery Protocol is used to discover neighboring MAC addresses if a P.C. needs to

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ping another device on the same subnet it needs to know what to the MAC address is of that neighboring

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device so determines the MAC address through neighbor Mac discovery NDP replaces IP vision for OP.

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So how do IP version 6 hosts discover routers ICMP Version 6 replaces IP version 4 ICMP again there's

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a lot of similarity between the protocols IP version 6 ICMP supports echo requests and echo replies

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so you can use pings in the same way as you did an IP version for.