Digi Connect WAN Series User Manual page 52

Digi Connect WAN Family web interface
Allow access from the following devices: A list of IP addresses of systems or devices
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that are allowed to connect to this device.
Allow access from the following networks: A list of networks based on an IP address and
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matching subnet mask that are allowed to connect to this device. This option allows
grouping several devices that exist on a particular subnet or network to connect to the
device without having to manually specific each individual IP address.
IP forwarding settings
When a Digi device acts as a router and communicates on both a private and public network with
different interfaces, it is sometimes necessary to forward certain connections to other devices. This is
also known as Network Address Translation (NAT) or Port Forwarding.
When an incoming connection is made to the device on the private network, the IP port is searched for
in the table of port forwarding entries. If the IP port is found, that connection is forwarded to another
specific device on the public network. The options and features described in this section are only
supported on some products and some firmware versions.
Port Forwarding/NAT is useful when external devices cannot communicate directly to devices on the
public network of the Digi device. For example, this may occur because the device is behind a firewall.
By using port forwarding, the connections can pass through the networks transparently. Also, Port
Forwarding/NAT allows multiple devices on the private network to communicate to devices on the
public network by using a shared private IP address that is controlled by Port Forwarding/NAT.
Use port forwarding to connect from a Digi device to a RealPort device. For this type of connection to
occur, your mobile wireless provider must be mobile-terminated.
IP Forwarding settings include:
Enable IP Routing: Enables or disables IP forwarding.
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Apply the following static routes to the IP routing table: You can configure the Digi device
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with permanent static routes. These routes are added to the IP routing table when this device
boots, or afterward when network interfaces become active or changes are made to this list of
static routes. Use static routes to route IP datagrams to a network that is not a local network
or accessible through the default route.
Digi Connect WAN Family User Guide
Configuration through the web interface
52