Specifications

display a list of the physical interfaces. The first few lines of the interface list for the SG3200 Series

are shown below.

Click on the interface in the list which is to be connected to the Internet. The properties for this

interface will now appear and the relevant settings can be entered or changed.

Press OK to save the changes. Although changes are remembered by CorePlus, the changed

configuration is not yet activated and won't be activated until CorePlus is told to activate the

changed configuration.

Remember that DHCP should not be enabled when using static IP addresses and also that the IP

address of the Default Gateway (which is the ISP's router) must be specified. As explained in more

detail later, specifying the Default Gateway also has the additional effect of automatically adding

a route for the gateway in the CorePlus routing table.

At this point, the connection to the Internet is configured but no traffic can flow to or from the

Internet since all traffic needs a minimum of the following two CorePlus configuration objects to

exist before it can flow through the Clavister Security Gateway:

• An IP rule defined in a CorePlus IP rule set that explicitly allows traffic to flow from a given

source network and source interface to a given destination network and destination

interface.

• A route defined in a CorePlus routing table which specifies on which interface CorePlus can

find the traffic's destination IP address.

If multiple matching routes are found, CorePlus uses the route that has the smallest (in other

words, the narrowest) IP range.

We must therefore first define an IP rule that will allow through traffic from a designated source

interface and source network. In this case let us assume we want to allow web browsing from the

internal network ge3_net connected to the interface ge3 to be able to access the public Internet.

To do this, we first go to Rules > IP Rule Sets > main in the navigation tree.

The empty main IP rule set will now appear. Press the Add button at the top left and select IP

Rule from the menu.

The properties for the new IP rule will appear. In this example, we will call the rule lan_to_wan.

Chapter 3: CorePlus Configuration