Package radvd

A Router Advertisement daemon

http://www.litech.org/radvd/

radvd is the router advertisement daemon for IPv6. It listens to router
solicitations and sends router advertisements as described in "Neighbor
Discovery for IP Version 6 (IPv6)" (RFC 2461). With these advertisements
hosts can automatically configure their addresses and some other
parameters. They also can choose a default router based on these
advertisements.

Install radvd if you are setting up IPv6 network and/or Mobile IPv6
services.

File Formats (Section 5)
radvd.conf
This file describes the information which is included in the router advertisement (RA) of a specific interface.
System Administration (Section 8)
radvd
radvd is the router advertisement daemon for IPv6. It listens to router solicitations and sends router advertisements as described in "Neighbor Discovery for IP...
radvdump
radvdump prints out the contents of incoming router advertisements sent by radvd or some other software implementing (parts of) "Neighbor Discovery for IP...