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

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5. Firewall, Failover and OOB Access

5.8 Firewall and Forwarding

Tripp Lite console servers with version 3.3 ﬁrmware (and later) have basic routing, NAT (Network Address Translation), packet

ﬁltering and port forwarding support on all network interfaces. This enables the console server to function as an Internet or

external network gateway, via cellular connections or other Ethernet networks on two Ethernet port models:

• Network Forwarding allows the network packets on one network interface (i.e. LAN1 / eth0) to be forwarded to another

network interface (i.e. LAN2/eth1 or dial-out/cellular). Locally networked devices can IP connect through the console server

to devices on remote networks.

• IP Masquerading is used to allow all devices on your local private network to hide behind and share one public IP address

when connecting to a public network. This type of translation is only used for connections originating within the private

network destined for the outside public network. Each outbound connection is maintained using a different source IP port

number.

When using IP masquerading, devices on the external network cannot initiate connections to devices on the internal

network. Port Forwards allow external users to connect to a speciﬁc port on the external interface of the console server and

be redirected to a speciﬁed internal address for a device on the internal network.

• With Firewall Rules, packet ﬁltering inspects each packet passing through the ﬁrewall and accepts or rejects it based on

user-deﬁned rules.

• Then Service Access Rules can be set for connecting to the console server/router itself.

5.8.1 Conﬁguring Network Forwarding and IP Masquerading

To use a console server as an Internet or external network gateway requires establishing an external network connection, then

enabling forwarding and masquerading functions.

Note: Network forwarding allows the network packets on one network interface (i.e. LAN1 / eth0) to be forwarded to another network

interface (i.e. LAN2/eth1 or dial-out/cellular) so locally networked devices can IP connect through the console server to devices on a remote

network. IP masquerading is used to allow all the devices on your local private network to hide behind and share one public IP address when

connecting to a public network. This type of translation is only used for connections originating within the private network destined for the

outside public network, and each outbound connection is maintained by using a different source IP port number.

By default, all console server models are conﬁgured so they will not route trafﬁc between networks. To use the console server

as an Internet or external network gateway, forwarding must be enabled so trafﬁc can be routed from the internal network to

the Internet/external network.

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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