Netgear Modem FVS318N User Manual Page 46

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IPv4 and IPv6 Internet and Broadband Settings
46
ProSafe Wireless-N 8-Port Gigabit VPN Firewall FVS318N
Configure 6to4 Automatic Tunneling
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.
Note: 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
Manually Configure an IPv4 Internet
Connection on
page 31). A dynamic IPv4 address can cause routing
problems on the 6to4 tunnels.
Note: 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 Manage the IPv6 LAN on page 73.
Typically, 6to4 tunnel addresses start with a 2002 prefix (decimal notification). On the
wireless VPN firewall, a 6to
4 tunnel is indicated by sit0-WAN1 (see View the Tunnel Status
and IPv6 Addresses on page 49).
To enable 6to4 automatic tunneling:
1. Select Netwo
rk Configuration > WAN Settings > 6 to 4 Tunneling.
Figure 24.
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