Hi,

we have discovered that the Hyper-V VMSwitch (we are using this for VLAN segmentation on our test setups) drops all packets coming from SOEM.

After playing around a bit it seems that Hyper-V VMSwitch does not like the src MAC address SOEM is using by default 01:01:01:01:01:01 since it is set to being multicast, which doesn't really make sense for a source address:

After we manually changed the packet to being unicast (the MAC being rewritten to 00:01:01:01:01:01) and retransmitting it, Hyper-V VMSwitch correctly forwards the packet:

Is this intended that way and a misunderstanding on our side or is this a bug in SOEM?

Thanks and kind regards :-)