I'm trying to make my linux host/router use the subnet address by default for outgoing connections instead of the tunnel address, mainly because of reverse DNS. I discovered that the source address selection algorithm always chooses 'preferred' addresses over 'deprecated' ones. So I figured the solution would be to make the tunnel address deprecated. However, the only mechanism I know of selecting the preferred lifetime of an address in linux is through radvd. I already checked google, the manpages of 'ip' and 'ifconfig', the IPv6 howto, but couldn't find any way of setting (or even checking) the 'preferred' lifetime of an address. (In Windows however, I believe it is possible) Does anyone know how I can do that? Or perhaps another way to make my host use the subnet address by default? The IPv6 default address selection RFC mentions an administrator policy for selecting addresses, but I don't know how to use that in Linux either.. :? Thanks in advance. :)