Package radvd

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.

Version: 2.20