CCNA--CCNP-Coaching--IPv6-Addressing
As a CCNA/CCNP applicant you are envisioned to understand IPv6
Throughout your occupation as a Cisco community engineer you will have to deal comprehending IPv6 address composition.
For your CCNA and CCNP reports you have to at some point confront and recognize IPv6. At very first look it can see fairly challenging compared to IPv4 that we are all employed to, in real truth IPv6 is really a just addressing protocol once you get previous the original shock. In ccnp boot camp uk write-up we are going to have a seem at Neighbour discovery protocol for layer two mapping.
When an IPv6 host or router wants to send out a packet to some other host on the very same network it will first of all seem into it's very own local neighbour database to discover if it has an IPv6 to MAC mapping, if it finds the proper mapping the host will use it, if there is no mapping the host will require to take care of the known layer 3 IPv6 address to a at present unknown Layer two MAC handle and to do this the host uses the Neighbor Discovery Protocol or NDP to discover the MAC address dynamically.
The Sending host will use a multicast information referred to as a Neighbor Solicitation (NS) icmp information to request the getting host for it really is MAC deal with, the obtaining host will reply with a Neighbor Ad (NA) icmp message unicast in return with the asked for MAC tackle.
How IPv6 achieves this is all in the design of the Neighbor Solicitation concept which tends to make use of a specific IPv6 location handle named a "Solicited Node Multicast", this solicited Node Multicast at any given instant represented all of the IPv6 hosts on the url, the previous 24 bits of the Solicited Node Address are the last 24 bits of the IPv6 deal with of the unit that a host is requesting the MAC from.
The IPv6 multicast location deal with is FF02::one:FF:/104 the ultimate 24 bits are manufactured up of the last 24 bits of the IPv6 address to which the information is currently being despatched to. For illustration if a host desired to find out the MAC handle of an IPv6 host tackled as 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/64 then the solicited Node Address will appear like the adhering to FF02::one:FF:CC:DDDD/104
When a sending hosts needs 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 previous 24 bits of the identified IPv6 deal with and spot them into the remaining 24 bits of the Solicited Node Handle and given that all IPv6 hosts pay attention to their own Solicited Node addresses, when they listen to their deal with they will reply with the MAC handle.
