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One method of bridging network interfaces
Authored by: signal15 on Oct 09, '06 09:09:39AM

You have just set up your mac to be a router, NOT a bridge. A bridge operates at layer 2, not layer 3.

If you had set up a bridge, you would have created a virtual bridge interface and added both network adapters to it. The bridge interface would get a single IP address, and then anything connected to either interface could have an address from the same range, and would use the address of the bridge interface as their default gateway.

This way, broadcasts and multicast packets (such as the Redezvous protocol) would be able to be seen by all machines on both interfaces. In addition, a bridge will participate in Spanning Tree if you have multiple switches in your environment. A common use of bridging on hosts is configuring redundant interfaces to connect to multiple switches, in case a switch or a network link goes down.

Bridging is an actual networking term, and what you have set up has nothing to do with bridging.

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