[Ns-bugs] [Bug 189] CSMA device receives all packets it sends

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http://www.nsnam.org/bugzilla/show_bug.cgi?id=189





------- Comment #5 from craigdo at ee.washington.edu  2008-05-30 16:46 -------
That depends on whether or not you ever want to have a device that receives its
own transmissions.

Right now every device receives every packet and filters it according to
destination, multicast and broadcast address.  One way to proceed is to filter
according to source, destination, multicast and broadcast.

As you mention, another way is to filter source in the channel.  However, in
reality there is no logic in a wire, so this strikes me as an odd place to
perform filtering.  Therefore, I was planning on adding the filtering to the
device.

Tom says that he knows of no case where a CSMA device would ever receive a
packet that it sends since the receiver is disabled during transmit to avoid
spurious collision detection.  Still, I think the right place to do the
filtering is on the device and not "inside the wire."


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