User manual

RLXIC-EV ♦ Intelligent Cellular Configuring your RLXIC-EV
RadioLinx® Intelligent Cellular Ethernet Gateway for Verizon User Manual
Page 50 of 104 ProSoft Technology, Inc.
March 10, 2010
Tip: If you are using Private Mode for all hosts (*HOSTPRIVMODE=1), you will need to make sure
that device IP, Starting IP and Ending IP are on the same subnet defined by the DHCP network
mask. If the subnet mask is 255.255.255.0, it is safe to use 192.168.x.y for each as long as the x is
the same number (0 in the example screen shot above) and the y is different (1 and 2 in the
example) and between 0 and 254.
Internal DHCP Server
DHCP (Dynamic Host Configuration Protocol) has become a primary component
of today's network environments. DHCP allows one server to automatically and
dynamically allocate network IP addresses and other network related settings
(such as subnet masks, routers, etc.) to each computer or device without the
need to set up each specifically or keep track of what addresses have already
been used.
In a default configuration, the RLXIC-EV acts as a DHCP host to any device
connected to its ports, providing that device with an IP address which can be
used to communicate on the Internet. In Public Mode, that will be the IP address
assigned by the cellular network. In Private Mode, that will be the IP addresses
defined in the LAN pages.
Address assignment in Public mode
1 When the RLXIC-EV registers on the cellular network, it is assigned an IP
address from the carrier, for example, 10.1.2.0.
2 Acting as a DHCP server, with Ethernet uses Public IP, when the RLXIC-EV
receives a DHCP request from an Ethernet device connected to its ports, it
hands off the assigned address to the device and sets up the default gateway
address as 10.1.2.1. If the fourth octet is already a 1, it assigns 10.1.2.2 as
the router address.
Note: The primary gateway, to the cellular network for any connected device, is enabled by default
3 The RLXIC-EV also sends a /24 netmask (255.255.255.0 by default) and sets
up a static route which maps 192.168.13.31 (or the address configured with
*HOSTPEERIP if it is changed) to 10.1.2.1 (or 10.1.2.2 if that was what the
gateway address was given as).
Tip: When PPPoE is used with the RLXIC-EV, DHCP is not needed. A tunnel is set up connecting
a device (such as your computer or a router) with the device. The device will then simply use the
MAC address of the RLXIC-EV to send all outgoing packets.