I don't know the answer to your question, but I don't see how you could 
have a user initiated backup, user initiated restore, or a DB Agent 
backup without allowing the client to initiate contact with the master. 
cheers, wayne

marshall.a.skare AT accenture DOT com wrote, in part, on 1/24/2005 4:03 PM:

>
> The question: It appears after looking through documentation that even 
> using NBU?s ?no callback? feature, a media server and/or client WILL 
> still initiate a connection back to the master using that method. Has 
> Veritas updated that behavior in version 5 to get rid of any 
> connections initiated towards the master? We have clients in a DMZ, 
> and cannot have them initiating connections into the internal 
> environment (where the master is) so the no callback feature as it?s 
> built in 4.5 will not work for us. If they?ve fixed this behavior in 
> version 5, then we may be in business. Otherwise, we?re kind of stuck 
> since we don?t want to dual-home the master and media servers in our 
> existing setup, either.
>