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5.8 Firewall & Forwarding
The console server has routing, NAT, packet filtering and port forwarding support on all physical and
virtual network interfaces.
This enables the console server to function as an Internet or external network gateway:
− 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.
− 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.
− 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.
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