GregorK, have a good long dig through the BearShare Labs forum and you will find several references re: methods of doing exactly what you want... needs two machines obviously..... I will also have a dig and if I come up with some links for you I will for sure pass them on....
Or, just ask Aleixia (sp?) or Sephiroth or Vinnie......

__________________
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Tomorrow's forecast:
Sunni in places, Shi'ite in others...