The NIC-order is already in the way you suggested.

About the suffix: If you have a primary Computer - DNS-suffix, the Server will try to register with that suffix in the DNS. But in our case, it shall only register each NIC with its own dns-suffix. That is due to the fact that the two subnets are physically seperated for security reasons. Imho this architecture is not really clever, but, well, it wasnt my decicion.

Apart from that, i dont really understand why i got these errors although the commands are obviously working.