System Administration Guide: IP Services

Known Issues With a 6to4 Router

The following known bugs affect 6to4 configuration:

4709338 - Need a RIPng implementation which recognizes static routes
4152864 - Configuring two tunnels with the same tsrc/tdst pair works

Implementing Static Routes at the 6to4 Site (Bug ID 4709338)

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 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.

Configuring Tunnels with the Same Source Address (Bug ID 4152864)

Bug ID 4152864 describes problems that occur when two tunnels are configured with the same tunnel source address, which is a serious issue for 6to4 tunnels.

Caution Caution - Do not configure a 6to4 tunnel and an automatic tunnel (atun) with the same tunnel source address. For information about automatics and the atun command, refer to the tun(7M) man page.