Sierra Wireless AirLink MP Guía de usuario descargar pdf (Pagina 47)

LAN/WiFi Configuration

Rev 2.0 C Aug.10 41

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 AirLink device 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 AirLink device registers on the cellular network, it is assigned an IP

address from the carrier, let’s say 10.1.2.0.

2. Acting as a DHCP server,with Ethernet uses Public IP, when the AirLink

device 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 AirLink device 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 AirLink device, 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 AirLink device to send all outgoing packets.

Host Port Routing

The "Host Network" is the equivalent of the IP route command.

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Sierra Wireless AirLink MP Guía de usuario Pagina 47