User Manual
Advanced Console Server & RIM Gateway User Manual 111
This enables the console server to function as an Internet or external network gateway, via cellular connections (e.g. ACM5004-
Gx cellular routers or other IM400, ACM5500 or ACM5000 model with external cellular modem) or via other Ethernet
networks on two Ethernet port models (IM42xx-2 and ACM500x-2 console servers):
ï€ 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 remote networks.
ï€ IP Masquerading is used to allow all the devices on your local private network to hide behind and share the 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.
ï€ When using IP Masquerading, devices on the external network cannot initiate connections to devices on the
internal network. Port Forwards allows external users to connect to a specific port on the external interface of the
console server/cellular router and be redirected to a specified internal address for a device on the internal
network.
ï€ With Firewall Rules, packet filtering inspects each packet passing through the firewall and accepts or rejects it
based on user-defined rules.
ï€ 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
(e.g. for the ACM5004-G setting up the 3G cellular link as detailed in Chapter 5) and then setting up forwarding and
masquerading.
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