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how to bridge IP packets only

Posted on 1997-11-13
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I want to setup a bridge that only passes IP packets.  The bridge that we have working right now bridges every type of packets from every type of protocol.

Is this possible? and if it is how do I go about doing it.
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Question by:pizarro
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sauron earned 400 total points
ID: 1586838
It is not possible to do this with a bridge.

By definition, a bridge links two physical networks into a single logical network. At its simplest, a bridge replicates all packets coming into one interface, on the other interface. More intelligent bridges learn which machines live where, and are more selective about what they bridge.

However, all bridges function at the data link layer of the OSI model - bridging of packets is done based on the MAC addresses, and the bridge is ignorant of protocols. As far as the bridge is concerned, all it sees is an ethernet frame, it neither knows nor cares about the protocol.

To filter by protocol, you need a router, or you may be able to get away with a brouter - you'd need to check hardware specs.
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by:pizarro
ID: 1586839
How would you use a router to filter a protocol?
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by:sauron
ID: 1586840
You simply enable routing for only one protocol, e.g. IP.

Most commercial routers will route IPX and IP. Some protocols, foe example NetBEUI, which Windows can use, are non-routable. It can be bridged, but not routed. The problem with this approach for you is that it would require you to subnet your existing network.
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