IPv6 (tutorial) - DD-WRT Wiki
wiki.dd-wrt.com › wiki › indexConfiguring Radvd (if your DD-WRT box is NOT your IPv6-router) Radvd is similar to a DHCP server. It advertises your IPv6 prefix to the local network, so that a new client can generate its own IP address. This config tells radvd to get an IPv6-address from the wired side, and properly announce it to the LAN (br0).