SOLVED: No luck with connecting 2 macines I figured it out finally. The problem was NOT rp_filter. QmidiNet is even setting the proper multicast group via SNMP, buuuuut ... This means it can receive multicast data but there is no one who can actually send it :D I did a: ip route add 224.0.0.0/4 table main scope link dev MIDI_NIC on all sending machines and it works like a charm :) My intention is now to make a small MIDI network monitor in a tcpdump | od | awk chain once done I'll upload it here Once more thanks for your input Reply
I figured it out finally.
The problem was NOT rp_filter. QmidiNet is even setting the proper multicast group via SNMP, buuuuut ...
This means it can receive multicast data but there is no one who can actually send it :D
I did a:
ip route add 224.0.0.0/4 table main scope link dev MIDI_NIC
on all sending machines and it works like a charm :)
My intention is now to make a small MIDI network monitor in a tcpdump | od | awk chain
once done I'll upload it here
Once more thanks for your input