Laird WB45NBT Reference Manual page 7

WB45NBT
Reference Guide
4.3.2 Use Case 2
A single host device with a static IP for Wi-Fi on the host device's Ethernet to the WB
The IP address that is used on the Wi-Fi network is statically assigned by the host device. This is often the case
when using the WB as an Ethernet to Wi-Fi dongle on an existing product where the Ethernet was set up to use
static IP addresses.
▪ Solution: Bridging
The WB acts as a transparent bridge between the Ethernet and Wi-Fi.
▪ Caveats:
It should send a ping packet or other IP packet from the host device's interface to the WB using static IP
address to register host device with WB's bridge code. Otherwise the bridge may not forward incoming
Wi-Fi packets to the host device.
Use Case 2 Example
4.3.3 Use Case 3
A single host device with DHCP running on the WB's Wi-Fi interface
A single device is connected to the Ethernet, USB Ethernet, or PPP serial; a DHCP client is running on the WB to
handle the Wi-Fi DHCP assignment.
▪ Solution: NAT
The WB does IP NAT and port masquerading to forward traffic from the Wi-Fi to host device. Host device
interface to the WB along with the corresponding WB interface should be assigned a non-routable
169.254.x.x IP address. The WB does a DHCP request on roam to support networks configured with
multiple subnets on the same SSID (determine if your customers do this).
Use Case 3 Example
4.3.4 Use Case 4
A single host device with a static IP on the WB's Wi-Fi interface
▪ Solution: NAT
The WB does IP NAT and port masquerading to forward traffic from Wi-Fi to the host device. The host
device interfaces to the WB, along with the corresponding WB interface, should be assigned a non-
routable 169.254.x.x IP address.
Use Case 4 Example
4.3.5 Use Case 5
Multiple host devices connected via Ethernet with DHCP running on the WB's Wi-Fi interface
▪ Solution: NAT
The WB does IP NAT and port masquerading to forward traffic from the Wi-Fi to each host device. Host
device interfaces to the WB along with the corresponding WB interface should be assigned non-routable
169.254.x.x IP addresses. The WB does a DHCP request on roam to support networks configured with
multiple subnets on the same SSID (determine if your customers do this).
Use Case 5 Example
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/wi-fi
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