Tripp Lite B093-004-2E4U-V Owner's Manual

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4. Serial Port, Host, Device and User Conﬁguration

4.11 IP Passthrough

IP passthrough is used to make a modem connection (e.g., Tripp Lite’s internal cellular modem) appear as a regular Ethernet

connection to a third-party downstream router. This allows the downstream router to use Tripp Lite’s modem connection as a

primary or backup WAN interface.

The console 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 alerts while in IP passthrough mode.

4.11.1 Downstream Router Setup

To use failover connectivity on the downstream router (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. 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 network interface or management LAN port with an

Ethernet cable.

Conﬁgure this interface on the downstream router to receive its network settings via DHCP. If failover is required, conﬁgure the

downstream router for failover between its primary interface and the Ethernet port connected to the console server.

4.11.2 IP Passthrough Pre-Conﬁguration

To enable IP passthrough:

• Conﬁgure the network interface and (where applicable) management LAN interfaces with static network settings

o Click Serial & Network: IP.

o For network interface and (where applicable) management LAN, select Static for the Conﬁguration Method and enter

the network settings (see section 3.3 Network Connection for more information).

o For the interface connected to the downstream router, you may choose any dedicated private network. The chosen

network will only exist between the console server and downstream router and will not normally be accessible.

o For the other interface, conﬁgure it as you would per normal on the local network.

o For both interfaces, leave Gateway blank.

• Conﬁgure the modem in Always On Out-of-band mode

o For a cellular connection, click System: Dial: Internal Cellular Modem.

o Select Enable Dial-Out and enter carrier details such as APN (see section 5.6 Cellular Modem Connection for more

information).

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Tripp Lite B093-004-2E4U-V 4-Port Console Server with 4G LTE Cellular Gateway, Dual GbE NIC, 4Gb Flash and Dual SIM