C o n f i g u r a t i o n 97automatically. The IAD will also prompt you to enable or disable IP OverBridging when bridging is being enabled on an interface that already has anIP address assigned.When an IP address is unconfigured or when bridging is disabled globally oron an interface (port), IP Over Bridging is disable automatically.When IP Over Bridging is enabled, the IAD examines all Ethernet packetsthat have its MAC address as a destination. The ARP packets and IP packetswith a destination IP address that is assigned to an interface on the IAD areprocessed as IP packets normally are, including ARP resolution. All otherpackets are processed in the usual way that a bridge processes them.When the IAD should send an IP packet out (for example, in response to aping, or RADIUS authentication), the ARP resolution is performed in amanner similar to the way it’s accomplished on Ethernet. If the destinationMac address is not known, the ARP broadcast request is sent to all interfaces.The interface that receives the reply is used to send the actual IP packet.NOTICE: When using IP Over Bridging with CopperMountain HDIA orCopperVPN, the default route for the IP interface should be specifiedusing the IP address of the router, rather than a WAN port number.Enable/Disable Bridging GloballyTo enable or disable bridging globally, follow the steps below.1 On the Bridge Configuration menu (Figure 4.61), type “G” to display thestatus of bridging and a prompt to enable or disable Bridging globally.2 Type “E” to enable bridging globally, or “D” to disable it globally. TheIAD saves the configuration and displays the Bridge Configuration menu(Figure 4.61).3 Continue with other configuration tasks, or press Escape to return to theBridge Configuration menu.Enable/Disable Bridging by PortTo enable or disable bridging by port, follow the steps below:1 Type “P” on the Bridge Configuration (Figure 4.61) menu to select Enable/Disable Bridging by Port. The IAD displays the interfaces available on thisIAD as shown in Figure 4.52.2 Type the number of the interface for which you want to enable bridging.The IAD displays a port table and prompts you to select the port.3 Type the number of the port. The IAD displays the status of bridging on thisinterface and port, and prompts you to enable or disable it.4 Type “E” to enable bridging on this port, or “D” to disable it. The IADupdates the configuration and displays the Bridge Configuration menu(Figure 4.61).
