Hello Jan,
no filter rules are installed. With Telnet from the realtime box to my host I can see the packets and replies with tcpdump, but the replies don't come back to the telnet client. If I stop the realtime networking stuff and load the nonrealtime driver, everything works fine. If I use an unoccupied port I also get no replies.
Ok, as you are able to transmit packets over rtproxy and tcpdump shows incoming data on that device, the only explanation is that, for some unknown reason, the Linux kernel drops all incoming rtproxy packets at the TCP/IP layer. Could you try to compare a packet received over normal eth0 and rtproxy? Do they differ in some way so that the kernel accounts the rtproxy packet as invalid?
Jan
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