Data Communication and Host Modes
DHCP and Routing
DHCP is built on a
Routing, at its most basic level, is the process of forwarding data on to the correct destination. One component of routing is address determination, directing data to the correct address either as its final destination or so it can be forwarded on. Selecting gateways where the data can be directed is another important component of routing.
The Raven X acts as a one to one gateway forwarding messages to and from one device that is connected to it. The Raven X does not provide routing for any more than that one device.
DHCP in the Raven X using Public Mode
1.When the Raven X registers on the cellular network, it is assigned an IP address from Verizon, let’s say A.B.C.D.
2.Acting as a DHCP server, in Public Mode, when the Raven X receives a DHCP request from an Ethernet device, it hands off the assigned address to the device and sets up the default gate- way address as A.B.C.1. If the fourth octet is already a 1, it assigns A.B.C.2 as the router address.
3.The Raven X also sends a /24 netmask (255.255.255.0) and sets up a static route which maps 192.168.13.31 (or the address configured with *HOSTPEERIP if it is changed) to A.B.C.1 (or A.B.C.2 if that was what the gateway address was given as).
Private Mode allows more direct control of the gateway address, device address, and netmask that is given out by the modem’s DHCP server. The IP Address that would be assigned to the end device is configured in the Private Mode settings (see above). Some applications which rely on specific IP addressing for their operation may have issues working in Private Mode when the modem has a
PPPoE with DHCP
When PPPoE is used with the Raven X, DHCP is not needed. A tunnel is set up connecting a device (such as your computer or a router) with the modem. The device will then simply use the Raven X’s MAC address to send all outgoing packets. To configure your Raven X and your com- puter to work with PPPoE, refer to the appendix for PPPoE, page 103.
The AirLink Modem as a Gateway
The primary purpose of the is to forward data from a single device connected to one of the ports to the network and, ultimately, under most circumstances, to the Internet in a one to one gateway configuration.
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