IPv6 ND Host-Host Communication Functions
The delivery of datagrams in IP can be divided into two methods: direct and indirect. Indirect datagram delivery requires that routers provide help to hosts, which leads to the host-router discovery functions described in the previous section. Direct delivery of datagrams is performed from one host to another on the same network. This doesn't require the use of routers, but necessitates other IPv6 ND protocol functions that involve communication directly between local hosts. These include next-hop determination, address resolution, neighbor unreachability detection, and duplicate address detection.
Next-Hop Determination
The first task that any host must perform when it wants to send a datagram is next-hop ...
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