Netgear FVS318N – Prosafe Wireless N VPN Firewall 参照マニュアル

If your network is an isolated IPv6 network that is not connected to an IPv6 ISP, you need to 
make sure that the IPv6 packets can travel over the IPv4 Internet backbone by enabling 
automatic 6to4 tunneling.

6to4 is a WAN tunnel mechanism for automatic tunneling of IPv6 traffic between a device 
with an IPv6 address and a device with an IPv4 address, or the other way around. 6to4 
tunneling is used to transfer IPv6 traffic between LAN IPv6 hosts and WAN IPv6 networks 
over the IPv4 network.

With 6to4 tunnels, IPv6 packets are embedded within the IPv4 packet and then transported 
over the IPv4 network. You do not need to specify remote tunnel endpoints, which are 
automatically determined by relay routers on the Internet. You cannot use 6to4 tunnels for 
traffic between IPv4-only devices and IPv6-only devices.

If the wireless VPN firewall functions as the endpoint for 6to4 tunnels 
in your network, make sure that the wireless VPN firewall has a 
static IPv4 address (see 

32). A dynamic IPv4 address can cause routing 

problems on the 6to4 tunnels.

If you do not use a stateful DHCPv6 server in your LAN, you need to 
configure the Router Advertisement Daemon (RADVD), and set up 
6to4 advertisement prefixes for 6to4 tunneling to function correctly. 
For more information, see 

Typically, 6to4 tunnel addresses start with a 2002 prefix (decimal notification). On the 
wireless VPN firewall, a 6to4 tunnel is indicated by sit0-WAN1 (see 

50).

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Select Network Configuration > WAN Settings > 6 to 4 Tunneling.