Other alternatives include 1) running a capture program on machine "y", if possible; 2) if the switch supports RMON, including capturing and saving packet traces, using that - however, I don't know what switches support that, I don't know what tools there are to do that, and I don't know if any of those tools can write to a file in a format Ethereal can read; and then having Ethereal read the resulting capture file.
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