[6bone] Building FreeBSD ipv6 router problem

[itojun@iijlab.net]

>I want to make some eksperiment with ipv6. I have already get my
> ipv6 address , here my ipv6 address allocation from my uplink: 
>3ffe:517:30a:5800:: /64. And my topology :
>		-- ---------
>---------------| Router　　　|--------------|
>           fxp1 ------------fxp0
>Uplink	    Router: FreeBSD   Client: WindowsXP(ipv6 ready)
>
>		4.6
>
>
>Firt step I try to connet my uplink, and its succed. I can ping6
> some ipv6 site like www.kame.net, www.jp.freebsd.org.
>Then I modify my rc.conf :
>
>ipv6_enable="YES"
>ipv6_network_interfaces="fxp0 fxp1"
>ipv6_defaultrouter="3ffe:517:30a:5800::1%fxp1"
>ipv6_gateway_enable="YES"
>ipv6_router_enable="YES"
>ipv6_ifconfig_fxp0="3ffe:517:30a:5880::1 prefixlen 64 up"
>rtadvd_enable="YES"
>rtadvd_interfaces="fxp0"
>
>With this configuration my router can advertise to downlink, but
> cannot receive router advertisement from uplink.
>Somebody can help me ?

	i see three problems:
	(1) global address cannot have scope identifier, so ipv6_defaultrouter
	    setting is wrong.
	(2) ipv6_defaultrouter setting specifies offlink address (not on the
	    same subnet).  it has to be on the same link as the node itself
	(3) routes should have link-local address as gateway, to make icmp6
	    redirect work.  you'd better run some routing protocol than to
	    specify ipv6_defaultrouter.

itojun