Ip Passthrough Setup - Cradlepoint CBA750B Product Manual

CBA750B | USER MANUAL Firmware version 5.0
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4.6 IP Passthrough Setup

The CBA750B's IP passthrough function takes the IP address of the attached modem and passes it through to the LAN.
By default, the CBA750B is configured for IP passthrough – the device ships with the ROUTER/PASSTHROUGH
SWITCH set to the I position ("O" is router mode; "I" is passthrough mode). Using IP passthrough disables some of the
device's other router functionality.
There are three methods for setting up IP passthrough:
1) The ROUTER/PASSTHROUGH SWITCH on the device itself is set to "I".
This forces a complete IP passthrough configuration with the following settings:
• Load balance is disabled; the highest priority WAN device is used.
• The Routing Mode is set to IP Passthrough. (Network Settings → Local Networks in the "Local Network
Editor" under "IP Settings")
• The Subnet Selection Mode will be set to "Automatically Create Subnet". (Network Settings → Local
Networks in the "Local Network Editor" under "IP Settings" – this shows once IP Passthrough is set as the
Routing Mode.) You have the option to override this and select Force 24 Subnet, which forces a subnet of
255.255.255.0 and uses the first available address in the network as the gateway. This is for compatibility with
equipment that may not handle modem addressing schemes and should not be used unless necessary.
• If you have created secondary networks, they are disabled; only the primary LAN is enabled.
2) In the administration pages, select Getting Started → IP Passthrough Setup. This wizard will force an IP
passthrough configuration that matches the ROUTER/PASSTHROUGH SWITCH settings shown above. Simply read
through the wizard and select Enable IP Passthrough on the second page.
3) For custom configuration, manually input IP passthrough settings in the administration pages (this is the preferred
method for network professionals). Go to Network Settings → Local Networks for most of these changes.
Depending on your settings, you may need to go to other pages as well (e.g. you may need to disable load balancing).
Changes in the administration pages can overrule the switch setting, AND vice versa (i.e. the most recent setting changes
are implemented, regardless of method). In the administration pages you can set the device to ignore changes to the
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