hi christian
yes for me it is working so correct, and ok, you dont see the hosts in the zentyal dns, but with rsat tools - dns, there i see the linux machines. but what i dont see, is the 3 windows7 clients. nslookup on windows7 clients dont work, because they make no ddns update. did u know, how to setup the windows7 clients right, so that they make also a dns entry in the DNS from Zentyal?
regards
pc-dok