radvd IPv6 Router Advertisement Daemon

It is important to understand what radvd is and is not to avoid common configuration mistakes:

• It is a route advertising daemon, not a configuration tool. radvd does not automatically configure the router's own interfaces, addresses, or routes. You must set up the router's networking (addresses, routes, etc.) manually or via system initscripts before running radvd.
• It is not a routing or forwarding daemon. radvd does not perform unicast or multicast routing. You must configure any necessary routing/forwarding in the system first; radvd only advertises prefixes to hosts.
• It does not automatically configure addresses from upstream RAs. By specification, routers ignore Router Advertisements (RAs). To use prefixes from upstream, you may need manual configuration, prefix delegation (RFC3633), or proxy-ND.
• It does not support setting up downstream interface addresses/routes from dynamic prefixes. If you have a dynamic prefix (e.g., /48), radvd can advertise /64 prefixes from it (with special support for 6to4 upstream interfaces), but it assumes interface addresses and routes are already set up manually.