Another question that comes to mind is, if there is negotiation with OSA, how does Linux tell that there is a real OSA involved? My assumptions (which may be false ;-)) were that Linux as a z/VM guest should not be able to tell whether a NIC is real or virtual. And in our case the NIC is always virtual, because we do not connect directly to the OSA, we go through a vswitch. The bridging works as long as the traffic does not go through the OSA card, so somehow the Linux guest is able to pass frames with MAC addresses it does not own. These frames are only dropped if they go towards the OSA. I was not able to tell whether they are dropped by the OSA or by the vswitch which connects to the OSA. But the same vswitch passes the bridged packets with no problems to other Linux machines inside the box...
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