Tripp Lite B098016V Owners Manual for B093- B097- and B098-Series Console Serv - Page 72

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). 72