We want to be able to have 2 domains that are seperate, but have the Topics/messages from domain 1 be able to be used in domain 2. Domain 2 is more for monitoring and data massaging applications. Nothing from domain 2 should go back to domain 1 including ACKNACKs and missed data requests. Domain 1 is RELIABLE_RELIABILITY. We had a problem on domain 2 and it slowed down the writers on domain 1 when it got flooded with ACKNACKs requesting data resends which couldn't be handled on domain 2 and would ask again etc. This is a problem for us.