Technical Details
NDP defines the following five ICMPv6 packet types:
- Router Solicitation
- Router Advertisement
- Neighbor Solicitation
- Neighbor Advertisement
- Redirect
These messages are used to provide the following functionality:
- Router discovery: hosts can locate routers residing on attached links.
- Prefix discovery: hosts can discover address prefixes that are on-link for attached links.
- Parameter discovery: hosts can find link parameters (e.g., MTU).
- Address autoconfiguration: stateless configuration of addresses of network interfaces.
- Address resolution: mapping between IP addresses and link-layer addresses.
- Next-hop determination: hosts can find next-hop routers for a destination.
- Neighbor unreachability detection (NUD): determine that a neighbor is no longer reachable on the link.
- Duplicate address detection (DAD): nodes can check whether an address is already in use.
- Redirect: router can inform a node about better first-hop routers.
- Recursive DNS Server (RDNSS) and DNS Search List (DNSSL) assignment via a router advertisement (RA) options. This is a new feature and not widely supported by clients.
Read more about this topic: Neighbor Discovery Protocol
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