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By selecting Listening Server, you may create a Remote port forward from the Server to this unit, or a
Local port forward from this unit to the Server:
Specify a Listening Port to forward from; leave this field blank to allocate an unused port.
Enter the Target Server and Target Port that will be the recipient of forwarded connectionsM!
4.13 IP Passthrough
IP Passthrough is used to make a modem connection (via the internal cellular modem) appear like a
regular Ethernet connection to a third-party downstream router, allowing the downstream router to use the
modem connection as a primary or backup WAN interface.
The server provides the modem IP address and DNS details to the downstream device over DHCP and
transparently passes network traffic to and from the modem and router.
While IP Passthrough essentially turns a console server into a modem-to-Ethernet half bridge, some
specific layer 4 services (HTTP/HTTPS/SSH) may still be terminated at the console server (Service
Intercepts). Also, services running on the console server can initiate outbound cellular connections
independent of the downstream router.
This allows the console server to continue to be used for out-of-band management and alerting and also
be managed via VCMS, while in IP Passthrough mode.
4.13.1 Downstream Router Setup
To use failover connectivity on the downstream router (aka Failover to Cellular or F2C), it must have two
or more WAN interfaces.
Note Failover in IP Passthrough context is performed entirely by the downstream router, and the built-
in out-of-band failover logic on the console server itself is not available while in IP Passthrough
mode.
Connect an Ethernet WAN interface on the downstream router to the console server’s Network Interface
or Management LAN port with an Ethernet cable.
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