What is a bridged interface and how would one be used

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A Bridge joins two or more interfaces to the same layer 2 (broadcast/collision domain). As if they were joined to the same switch. A bridged interface can filter traffic without being involved in the IP layer of the connection.

It is normally best to avoid such configurations as they can be problematic, but they can also be useful for several types of configurations, such as:

  • Bridging a wireless interface to a LAN
  • Transparent firewall (WAN/LAN bridge)
  • Filtering between portions of a single subnet

Bridge traffic is filtered on the member interfaces by default. For more information, see Interface Bridges