SET UP
Page 88
User guide ref 9019409-01
UMTS GPRS EDGE router ref. IPL-3G
22 USB to IP gateway
22.1 Principles
The IPL-3G-1201 provides a USB to IP gateway.
It is able to forward IP traffic from devices connected to the Ethernet network to a USB device.
On the USB interface, the IPL-3G-1201 behaves like a USB host and a PPP client.
The USB device connected to the IPL-3G-1201 USB interface must behave like a PPP server.
Destination IP address; main case
When a device, connected to the Ethernet network, needs to transmit data to the USB device, the
destination address of the IP frames which need to be transmitted to the USB device must be a
specific IP address assigned to the USB gateway of the IPL-3G (see the configuration below).
Destination IP address; Modbus case
If no specific IP address is assigned to the USB gateway (see below), the IPL-3G forwards only
modbus TCP traffic to the USB interface.
The destination IP address of the IP frames must be the LAN IP address of the IPL-3G router.
22.2 Configuration
Select the “Setup” menu and then the “USB” menu.
“Activate” checkbox :
Select the “Activate” checkbox.
“Use a specific IP address” checkbox :
If modbus TCP traffic only has to be forwarded to the USB device, that checkbox must not be
selected.
If other kinds of traffic have to be forwarded, that checkbox has to be selected.
“Specific IP address” parameter :
If modbus TCP traffic only has to be forwarded to the USB interface, no IP address has to be entered.
If other kinds of traffic have to be forwarded to the USB device, an additional IP address must be assigned the
IPL-3G.
That address belongs to the network connected to the LAN interface of the IPL-3G. It is the IP address of the
USB gateway.
It will be used as the destination IP address of the IP frames which must be forwarded to the USB device.
“Accept WAN traffic” checkbox:
It is necessary to select that checkbox it the PC is connected to the network connected to the WAN
interface.
It is not necessary to select that checkbox if the remote PC is connected to the RAS through a VPN.
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