make sure that prefix go away when interface vanishes.  from netbsd XXX is there any possibility for dangling link (i.e. refcnt > 1) to "pr"?
make sure that prefix go away when interface vanishes.  from netbsd
XXX is there any possibility for dangling link (i.e. refcnt > 1) to "pr"?

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame