Paul, thanks a lot again!
I got something working but I don't have the time today to do further tests. Just wanted you to know that thanks to your help (and the help of another friend of mine who brought me OpenBSD 13 years ago) I think I know what my mistake was and what needed to be done. I'll post a brief description of what I did to get it working in the next days to get this into the archives. Regards, T.