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Alvarez16Wells

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CCNA - CCNP Coaching - IPv6 Addressing
As a CCNA/CCNP prospect you are predicted to realize IPv6


During your career as a Cisco network engineer you will have to deal comprehending IPv6 tackle structure.

For your CCNA and CCNP reports you have to at some point confront and comprehend IPv6. At initial look it can see really daunting in contrast to IPv4 that we are all employed to, in actual reality IPv6 is very a basically addressing protocol after you get past the original shock. In this post we are likely to have a search at Neighbour discovery protocol for layer 2 mapping.

When an IPv6 host or router needs to ship a packet to some other host on the identical network it will very first of all look into it is possess local neighbour database to discover 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 want to solve the identified layer three IPv6 handle to a at present unknown Layer 2 MAC address and to do this the host employs the Neighbor Discovery Protocol or NDP to discover the MAC handle dynamically.

The Sending host will use a multicast concept named a Neighbor Solicitation (NS) icmp information to inquire the acquiring host for it's MAC deal with, the obtaining host will reply with a Neighbor Ad (NA) icmp information unicast in return with the requested MAC address.

How ccnp training london achieves this is all in the development of the Neighbor Solicitation information which makes use of a special IPv6 destination address referred to as a "Solicited Node Multicast", this solicited Node Multicast at any provided second represented all of the IPv6 hosts on the website link, the previous 24 bits of the Solicited Node Tackle are the final 24 bits of the IPv6 tackle of the system that a host is requesting the MAC from.

The IPv6 multicast vacation spot handle is FF02::1:FF:/104 the closing 24 bits are made up of the final 24 bits of the IPv6 handle to which the concept is being sent to. For illustration if a host wished to discover the MAC tackle of an IPv6 host resolved as 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/64 then the solicited Node Address will appear like the pursuing FF02::one:FF:CC:DDDD/104

When a sending hosts wants to get the MAC address from the IPv6 host of 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/sixty four it will get the very last 24 bits of the known IPv6 handle and place them into the remaining 24 bits of the Solicited Node Address and since all IPv6 hosts hear to their own Solicited Node addresses, when they listen to their deal with they will reply with the MAC address.

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