
Raven X HSDPA for Cingular - User Guide, version 2.33 98
Frequently Asked Questions and Technical Support
What is the difference between Private and Public mode?
When your Raven X is powered on, ALEOS, acting as a PPP client, negotiates a PPP session with
Cingular’s network at the conclusion of which it is assigned an IP address by your cellular pro
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vider. How this address is further acted upon by the modem is determined by Private or Public
Mode.
Public Mode (*HOSTPRIVMODE=0):
The IP address assigned by Cingular is passed on to the devices connected to the modem.
If there is a computer or device connected to the modem’s Ethernet port, the IP address assigned
by your cellular provider is passed on to the computer or device by the DHCP server in the
modem.
Private Mode (*HOSTPRIVMODE=1):
The IP address assigned by Cingular is not the address that is assigned to the computer or device
connected to the Raven X’s Ethernet port during the PPP negotiation or DHCP IP assignment.
Instead, the computer or device connected to the Raven X on the Ethernet port is assigned the IP
address configured in *HOSTPRIVIP and uses the IP address configured in *HOSTPEERIP to
communicate to the modem.
How do I set up Private Mode? How do I connect to my Raven X to my router
or to Linux?
Private Mode is at times preferred or required to provide network connectivity to a Linux device,
routers, or other devices. Private mode will generally also work with any PC in an environment
where there is a need for the Raven X to be configured to work with an internal network.
There are four AT commands you will need to set in the modem. You can set them using Wireless
Ace or a AT commands with a terminal connection (page
34). The examples shown are from
Wireless Ace.
*HOSTPRIVMODE=1 - Private Mode turned on.
*HOSTPRIVIP=[IP address] - IP address assigned to computer or other end device con-
nected directly to the modem (example, 192.168.1.8).
*HOSTPEERIP=[IP address] - IP address assigned to modem for local, not cellular, com-
munication (example, 192.168.1.9).
*HOSTNETMASK=[subnet mask] - Subnet Mask setting (example, 255.255.255.0).
The IP addresses configured need to be appropriate for your network. For most internal networks,
using the IP range of 192.168.x.x is generally preferred. The first three parts (called octets) need
to be the same for all devices on the network (such as 192.168.1.x), but you can use any number
from 0 to 254 for the last part if you use a subnet mask of 255.255.255.0 (fewer numbers are
usable with different subnets). The last part for each IP address on the network needs to be differ
-
ent.
The *HOSTPRIVIP and the *HOSTPEERIP need to exist on same subnet, the easiest subnet to
configure is 255.255.255.0 which allows for 255 IP addresses on the same subnet. Unless you
understand the complexities of subnetting or you are instructed to use a different subnet by your
Network Administrator, it is safe to use 255.255.255.0 with an internal 192.168.x.x network.
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