Please remember that in order to use a 10/100 MBit card on Mediator, you need to have a Voodoo card installed. A plain Mediator with only a 10/100 MBit network card won't work, but it will work fine with a 10 MBit card.
Mostly aimed at people new to Mediator, as it's not clear on Elbox' site, only in the docs.
