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add key name to WAN Settings (#197)

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arednGettingStarted/advanced_config.rst
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@ -417,15 +417,23 @@ WAN Settings
Several WAN access settings can be adjusted in this section. It is recommended that these settings be left at their default values, but specific use cases may require you to change them.
Allow MESH nodes to use my WAN
*aredn.@wan[0].olsrd_gw*
The default value is ``OFF`` and it is recommended that you use this default unless there is a special reason to enable it. Setting the value to ``ON`` will allow this node to route traffic from its MESH RF interface to/from your WAN interface. Since the WAN interface typically provides a gateway to the Internet, it is not desirable to route Internet traffic over your Mesh RF interface. AREDN |trade| is an FCC Part 97 amateur radio network, so be sure that any traffic which will be sent over the radio complies with FCC Part 97 rules. If you want local devices to have wireless Internet access, consider using an FCC Part 15 access point instead of your node's WAN gateway.
Allow my LAN devices to access my WAN
*aredn.@wan[0].lan_dhcp_route*
The default value is ``ON`` which allows your LAN-connected devices to access your node's WAN network. Setting this value to ``OFF`` will prevent LAN devices from accessing the WAN, which means that your LAN hosts will not be able to reach the Internet even if your node has Internet access via its WAN. You may need to disable WAN access if your device needs to be connected to two networks at once, such as an Ethernet connection to your node as well as a WiFi connection to a local served agency network.
Provide my LAN devices with a default route
*aredn.@wan[0].lan_dhcp_defaultroute*
Your node's DHCP server provides routes to LAN devices so they can access its available networks. A default route is required for WAN access, and that is provided automatically if "Allow my LAN devices to access my WAN" is ``ON`` as discussed above. However, some LAN devices (such as certain IP cameras) may not support DHCP option 121 and will require a default route in order to access the mesh network. Setting this value to ``ON`` will provide a default route to those devices. If a LAN device is connected to two networks at once, such as an Ethernet connection to your node as well as a WiFi connection to a local served agency network, care should be taken to understand how the device will deal with default routes to more than one network.
WAN VLAN Id
*aredn.wan.vlanid*
.. important:: This feature only applies to node hardware which requires a VLAN tag for the WAN interface. It will not appear on hardware where the Ethernet ports are on a switch chip, since changing the default VLAN number is not supported on those devices at the present time. It will appear as a ``blank`` field on devices that have a dedicated WAN port and therefore do not need a VLAN tag for their WAN interface.
If you have node hardware that uses a VLAN tag for the WAN interface, then the default WAN VLAN identifier is ``1``. In some cases this default VLAN may be in use already or may be reserved by other equipment on your network. This field allows you to change the VLAN number being used on your node's WAN interface.