3Com 3C840 manual 6CHAPTER 5 Configuring Bridging

5-6CHAPTER 5: CONFIGURING BRIDGING

IP Forwarding refers to the routing of IP packets from one interface to another. It does not affect communicating to the OfficeConnect Remote 840 itself. Even when IP Forwarding is disabled, you can perform non-routing functions such as use the OfficeConnect Remote 840 Manager from a Web browser and use PING.

To bridge IP traffic:

1Add the bridge network over the LAN (see the instructions above).

2From the OfficeConnect Remote 840 home page, select Configuration > Global > IP > IP Settings. This brings up the IP Settings screen:

3Turn off IP forwarding by unchecking the Forwarding check box.

4Your browser will temporarily lose connection with the OfficeConnect Remote 840. Wait a few seconds, click the browser's Stop button; then click Reload.

MAC-EncapsulatedBecause routers base their forwarding decision on network-level

Routingaddresses, packets that are routed over a WAN are transmitted without MAC-layer addresses. Additionally, address resolution procedures that can be used to determine the destination MAC address for a packet are not required.

Conversely, packets that are bridged over a Wide Area Connection include MAC-layer information. Address resolution procedures are required.

MAC-Encapsulated Routing uses network-level addresses for forwarding decisions but transmits MAC-layer addresses over the Wide Area Connection. Additionally, address resolution procedures are used. To the remote site, the packets appear as if they had been bridged.

This feature allows the routing features of the OfficeConnect Remote 840 (i.e., address translation, DHCP Server, DNS Proxy, etc.) to be employed in a bridged environment.

MAC-Encapsulated Routing is specified on a remote site basis. When

MAC-Encapsulated Routing is enabled in a remote site profile, packets for