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− 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 and then setting up forwarding and masquerading.
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 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.
By default, all console server models are configured so that they will not route traffic between networks.
To use the console server as an Internet or external network gateway, forwarding must be enabled so
that traffic can be routed from the internal network to the Internet/external network:
Navigate to the System: Firewall page, and then click on the Forwarding &Masquerading tab
Find the Source Network to be routed, and then tick the relevant Destination Network to
enable Forwarding
IP Masquerading is generally required if the console server will be routing to the Internet, or if the
external network being routed to does not have routing information about the internal network behind
the console server.
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