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CCNA - CCNP Education - IPv6 Addressing

CCNA - CCNP Education - IPv6 Addressing

As a CCNA/CCNP prospect you are envisioned to recognize IPv6

 

During your career as a Cisco community engineer you will have to deal comprehension IPv6 deal with construction.

 

For your CCNA and CCNP research you have to at some point confront and comprehend IPv6. At ccnp training london can see very overwhelming in comparison to IPv4 that we are all utilized to, in real simple fact IPv6 is fairly a merely addressing protocol when you get past the original shock. In this article we are going to have a seem at Neighbour discovery protocol for layer two mapping.

 

When an IPv6 host or router requirements to ship a packet to some other host on the identical network it will very first of all appear into it really is very own neighborhood neighbour database to uncover if it has an IPv6 to MAC mapping, if it finds the appropriate mapping the host will use it, if there is no mapping the host will need to take care of the known layer 3 IPv6 handle to a at the moment unidentified Layer 2 MAC deal with and to do this the host employs the Neighbor Discovery Protocol or NDP to learn the MAC handle dynamically.

 

The Sending host will use a multicast information named a Neighbor Solicitation (NS) icmp message to request the getting host for it really is MAC deal with, the receiving host will reply with a Neighbor Advertisement (NA) icmp information unicast in return with the asked for MAC address.

 

How IPv6 achieves this is all in the construction of the Neighbor Solicitation concept which tends to make use of a unique IPv6 location tackle named a "Solicited Node Multicast", this solicited Node Multicast at any given second represented all of the IPv6 hosts on the url, the last 24 bits of the Solicited Node Tackle are the very last 24 bits of the IPv6 tackle of the unit that a host is requesting the MAC from.

 

The IPv6 multicast destination deal with is FF02::one:FF:/104 the ultimate 24 bits are made up of the previous 24 bits of the IPv6 deal with to which the information is becoming sent to. For illustration if a host desired to find out the MAC address of an IPv6 host addressed as 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/64 then the solicited Node Tackle will seem like the following FF02::one:FF:CC:DDDD/104

 

When a sending hosts desires to get the MAC handle from the IPv6 host of 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/64 it will consider the previous 24 bits of the recognized IPv6 tackle and place them into the remaining 24 bits of the Solicited Node Deal with and since all IPv6 hosts hear to their possess Solicited Node addresses, when they listen to their address they will reply with the MAC tackle.