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ICMPv6 | IPv6 address | IPv6 header |


The Internet Control Message Protocol version 6, includes Neighbor Discovery functions which are used by nodes on the same link to discover each other's presence, to determine each others link layer address and to find routers. The application shows you some of the Neighbor Discovery functions. The messages are:

Router Advertisement: routers advertise their presence together with various link and IP parameters either periodically or in response to a Router Solicitation message. Router Advertisements contain prefixes, link layer and IP address of the router, a suggested hop limit value, etc.

Router Solicitation: when an interface becomes enabled, hosts may send out Router Solicitations that request routers to generate a Router Advertisement immediately

Neighbor Solicitation: it is sent by a node to determine the link layer address of a Neighbor. The requested host sends a neighbour Advertisement as response including its link layer address

The following addresses are shown for the nodes:
Link-local address - an IPv6 unicast address that has a scope limited to the local link. Link-local addresses are automatically configured on all IPv6 interfaces by using the specific prefix FE80::/10 and adding the interface ID in the modified EUI-64 format
Global unicast address - an IPv6 unicast address similar to a typical IPv4 address. It includes a global routing prefix, a subnet identifier and the interface ID. Global unicast addresses can be configured automatically using the information in router advertisement messages