Справочник Пользователя для Wellink Corporation W202ER-4
VisionNet 202ER-4 ADSL Ethernet Router User’s Guide
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Configuring Bridging
The VisionNet 202ER-4 can be configured to act as a bridging
device between your LAN and your ISP. Bridges are devices that
enable two or more networks to communicate as if they are two
segments of the same physical LAN. This chapter describes how to
configure the VisionNet 202ER-4 to operate as a bridge.
device between your LAN and your ISP. Bridges are devices that
enable two or more networks to communicate as if they are two
segments of the same physical LAN. This chapter describes how to
configure the VisionNet 202ER-4 to operate as a bridge.
Note
Before changing your bridge configuration, check with your ISP to
determine the type of connection they use to exchange data with
their customer’s DSL modems (such as Ethernet bridging or IP
routing).
determine the type of connection they use to exchange data with
their customer’s DSL modems (such as Ethernet bridging or IP
routing).
Overview of Bridges
A bridge is a device used to connect two or more networks so they
can exchange data. A bridge learns the unique manufacturer-
assigned hardware IDs of each computer or device on both (or all)
networks it is attached to. It learns that some of the IDs represent
computers attached via one of the device's interfaces and others
represent computers connected via other interfaces. For example,
the hardware IDs of your home computers are attached via the
Ethernet port, and the hardware IDs of your ISP's computers are
attached via the WAN (DSL) port. It stores the ID list and the
interface associated with each ID in its bridge forwarding table.
can exchange data. A bridge learns the unique manufacturer-
assigned hardware IDs of each computer or device on both (or all)
networks it is attached to. It learns that some of the IDs represent
computers attached via one of the device's interfaces and others
represent computers connected via other interfaces. For example,
the hardware IDs of your home computers are attached via the
Ethernet port, and the hardware IDs of your ISP's computers are
attached via the WAN (DSL) port. It stores the ID list and the
interface associated with each ID in its bridge forwarding table.
When the bridge receives a data packet, it compares its destination
hardware ID to the entries in the bridge forwarding table. When the
packet's ID matches one of the entries, it forwards the packet
through the interface that connects to the corresponding network.
Note that the bridge does not send the data directly to the receiving
computer, but broadcasts it to the receiving network, making it
available to any node on that network. On the receiving network, a
LAN protocol such as Ethernet takes over, helping the packet
reaches its destination.
hardware ID to the entries in the bridge forwarding table. When the
packet's ID matches one of the entries, it forwards the packet
through the interface that connects to the corresponding network.
Note that the bridge does not send the data directly to the receiving
computer, but broadcasts it to the receiving network, making it
available to any node on that network. On the receiving network, a
LAN protocol such as Ethernet takes over, helping the packet
reaches its destination.
When the bridge does not recognize a packet’s destination
hardware ID, it broadcasts the packet through all of its interfaces –
to each network it is attached to.
hardware ID, it broadcasts the packet through all of its interfaces –
to each network it is attached to.