I've got a IPv4 only ISP and get a public IPv4 address from them. On my router, a Linux machine, I've setup a 6in4 tunnel using a tunnel provider. So I now have a tunnel interface (point-to-point) with a Global scope IPv6 address: 2001:abcd:abcd::2/64. As I understand it, the whole /64 block is routed to me, i.e., I can freely define any address in that block (::3, ::4, etc). From my router, I can reach IPv6 sevices just fine (ping6 works, traceroute6 works). The router does NAT for my LAN. Now I want to route one machine inside my LAN using IPv6 as well, assigning it ::3.
The current setup:
eth0.123: DHCP from public Internet on VLAN 123
eth1: 192.168.1.1 + IPv6 link local
I've tried adding 2001:abcd:abcd::3/64 to the interface IP of my LAN machine, but it cannot ping 2001:abcd:abcd::2/64. Therefore, I fail to setup my IPv6 network even before I come to the routing part.
How do I have to configure the network interfaces so my router can talk to my local machine using IPv6 and then how do I allow routing of IPv6 traffic to the Internet?