Appendix B: Ip-Passthrough Example - Microhard Systems BulletPlus Operating Manual

Appendix B: IP-Passthrough Example (Page 1 of 2)
By completing the Quick Start process, a user should have been able to log in and set up the
work with their cellular carrier. By completing this, the modem is ready to be used to access the internet
and provide mobile connectivity. However, a common application of the
devices remotely. In order to do this, the
to send it to. To accomplish this there are three options :
In this section we will talk about IP-Passthrough and how to configure the BulletPlus and the connected
device/PC to work with IP-Passthrough. IP-Passthrough means that the BulletPlus is transparent, and all
outside (WAN) traffic is simply sent directly to a single device connected to the physical LAN RJ-45 port on
the BulletPlus (With exception of port 80, which is retained for remote configuration (configurable). Also,
any traffic that is sent to the RJ45 port is sent directly out the WAN port and is not processed by the
BulletPlus.
IP-Passthrough is ideal for applications where only a single device is connected to the BulletPlus, and
other features of the BulletPlus are not required. When in pass-through mode, most features of the
BulletPlus are bypassed, this includes the serial ports, the GPS features, VPN, and much more. The
advantage of IP-Passthrough is that the configuration is very simple.
In the example below we have a BulletPlus connected to a PC (PC2). The application requires that PC1 be
able to access several services on PC2. Using Port Forwarding this would require a new rule created for
each port, and some applications or services may require several ports so this would require several rules,
and the rules may be different for each installation, making future maintenance difficult. For IP-
passthrough, PC1 only needs to know the Public Static IP Address of the BulletPlus, the BulletPlus would
then automatically assign, via DHCP, the WAN IP to the attached PC2, creating a transparent connection.
Step 1
Log into the BulletPlus (Refer to Quick Start), and ensure
that DHCP is enabled on the Network > LAN (edit)
page.
Step 2
Since PC2 requires port 80 to be used as its Web server port, port 80 cannot be used on the BulletPlus, by default it
retains this port for remote configuration. To change the port used by the BulletPlus, navigate to the System > Services
page. For this example we are going to change it to port 8080. When changing port numbers on the BulletPlus, it is
recommended to reboot the unit before continuing, remember the new WebUI port is now 8080 when you log back into
the BulletPlus. (e.g. 192.168.168.1:8080).
© Microhard Systems Inc.
- IP-Passthrough
- Port Forwarding
- DMZ (a type of Port Forwarding)
Cellular Network/
PC1: Connected to
internet.
BulletPlus
must be told how to deal with incoming traffic, where
Wireless Cellular
Connection
Internet
BulletPlus
is to access connected
Connected to RJ45
LAN Ethernet Port.
WAN IP: 74.198.186.193
(Cellular Carrier)
PC2: (DHCP)
WebServer running on port 80
LAN IP: 74.198.186.1 (Used
for WebUI from LAN)
BulletPlus
to
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