© Microhard Systems Inc. 181
Appendix C: IP-Passthrough
Step 3
Now IP-Passthrough can be enabled on the IPn3G. Under the Carrier
> Config tab, IP-Passthrough can be found. To enable this feature,
select “Ethernet” from the drop down box. Once the changes are
applied, whichever device is physically connected to the RJ45 port,
will dynamically be assigned the WAN IP Address. In this example,
this would be 74.198.186.193.
The default IP address of 192.168.0.1 on the LAN is no longer
available, but it is still possible to access and configure the IPn3G on
the LAN side, by using the X.X.X.1 IP Address, where the first 3
octets of the WAN IP are used in place of the X’s. (e.g. 74.198.186.1,
and remember the HTTP port in this example was changed to 8080).
Step 4
Attach the remote device or PC to the RJ45 port of the IPn3G. The end
device has to be set up for DHCP to get an IP address from the IPn3G. In
the test/example setup we can verify this by looking at the current IP
address. In the screenshot to the right we can see that the Laptop
connected to the IPn3G has a IP Address of 74.198.186.193, which is the IP
address assign by the cellular carrier for the modem.
Step 5 (Optional)
IP-Passthrough operation can also be verified in the IPn3G. Once IP-
Passthrough is enabled you can access the IPn3G WebUI by one of the
following methods:
Remotely on the WAN side (usually the internet), using the WAN
IP, and the port specified for HTTP operation (or, if enabled, by
using the HTTPS (443) ports), in this example with would be
74.198.186.193:8080.
On the LAN side, by entering in the first 3 octets of the WAN IP
and .1 for the fourth, so in our example 74.198.186.1:8080.
By using the NDIS/USB interface, by entering in
192.168.111.1:8080
Once logged in, navigate to the System > Summary page. Under WAN IP
Address it should look something like shown in the image to the right,
74.198.186.193 on LAN.
Step 6
The last step is to verify the remote device can be accessed. In this example a PC is connected to the RJ45 port of the
IPn3G. On this PC a simple apache web server is running to illustrate a functioning system. On a remote PC, enter the
WAN IP Address of the IPn3G into a web browser. As seen below, when the IP Address of the IPn3G is entered, the
data is passed through to the attached PC. The screen shot below shows that our test setup was successful.
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