Wow, fast answer. THX.

You're right, I have two DSS V6 in the same configuration.
Setup as shown in the pdf, networks 192.168.0.x to 192.168.3.x. Left side is .230, right side .240.
SCSI ID is on both sides 0000000000000000 and LUNs are 0.
AUXs are set, checked every setting twice (or more ).

I know the video, I have seen some good webinars with a german presenter (Janusz Bak).

Still doesn't working.