[Internet] | +-----+-----------+ | FW that filters | | 6to4 / proto-41 | +-----+-----------+ | | +--------------------------------+ | 1.2.3.4 | Router that does NAT44 and | [ISP]---------(WAN) 6to4 tunneling+routing | 2002:102:304::1 | (Apple Airport Extreme?) | | (Windows w/ICS enabled?) | | (Other SOHO router model?) | +-------------------(LAN)--------+ 2002:102:304:1::1 | 192.168.1.1 (SLAAC or DHCPv6) | (DHCPv4) | 2002:102:304:1:21c:bfff:fe02:f2a5 | 192.168.1.2 +-----------------------------------+-------------+ | | | OS X or Linux host - prefers 6to4 over IPv4 | | | +-------------------------------------------------+