The following issue occurs on 6to4 sites with routers that are internal to the 6to4 boundary router. When you configure the 6to4 pseudo-interface, the static route 2002::/16 is automatically added to the routing table on the 6to4 router. Bug 4709338 describes a limitation in the Oracle Solaris RIPng routing protocol that prevents this static route from being advertised to the 6to4 site.
Either of the following workarounds are available for Bug 4709338.
Add the 2002::/16static route to the routing tables of all intrasite routers within the 6to4 site.
Use a routing protocol other than RIPng on the 6to4 site's internal router.