2000-A2-GB20-10 - 121 - February 2004To implement IP Over Bridging, enable bridging globally, and by port onthe WAN connection. (At least one DLCI/PVC must be configured), andassign an IP address to the WAN interface. When these conditions exist(either in Routing or Bridging configuration), the IAD will prompt you toenable or disable IP Over Bridging. When the IP address is unconfigured,IP Over Bridging is disabled automatically. The IAD will also prompt you toenable or disable IP Over Bridging when bridging is being enabled on aninterface that already has an IP address assigned.When an IP address is unconfigured or when bridging is disabled globallyor on 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 IPpackets with a destination IP address that is assigned to an interface onthe IAD are processed as IP packets normally are, including APRresolution. All other packets are processed in the usual way that a bridgeprocesses 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 asimilar manner as accomplished on Ethernet. If the destination Macaddress 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.Enabling or Disabling Bridging GloballyTo enable or disable bridging globally:1. On the Main menu, type G to select Enable/Disable Bridging Globally.2. The IAD displays the status of bridging, and a prompt:Bridging is globally DISABLEDEnter E to Enable, D to Disable:Type E to enable bridging globally, or D to disable it globally.3. The IAD saves the configuration and displays the Bridge Configurationmenu.4. Continue with other configuration tasks, or press Escape to return tothe Bridge Configuration menu.5. Reset the IAD (page 14) when you finish bridge configuration.Enabling or Disabling Bridging by PortTo enable or disable bridging by port:1. Type P on the Bridge Configuration menu to select Enable/DisableBridging by Port.2. The IAD displays the interfaces available on this IAD, and a prompt:Available Interfaces:1. G2237 xDSL2. 10/100BaseT Ethernet0. (Abort)NOTE When using IP Over Bridging with CopperMountain HDIA orCopperVPN, the default route for the IP interface should bespecified using the IP address of the router, rather than aWAN port number.
