I solved exactly this issue with SSH tunnels. The description on how I 
did it is in the Bacula Wiki in the howto section.

Patrick Ben Koetter wrote:
> I run bacula-dir and bacula-sd in an internal network and a few hosts outside
> on the Internet.
>
> When I want to run a job for an external host, the host tells me it can
> resolve the storage server. Understandable. There's no DNS that tells about
> the internal hosts address.
>
> But even if, the client wouldn't be able to connect since the storage sits in
> a private network behind a NAT gateway.
>
> I've read "Dealing with Firewalls"
> <http://www.bacula.org/en/rel-manual/Dealing_with_Firewalls.html>, but from my
> (limited) understanding an essential part is missing - the part where the
> external connection is port forwarded to the internal storage server.
>
> Am I right?
>
> Are there any other 'good solutions' to deal with such a setup? I believe this
> is a typical requirement and I would expect there to be more than one 
> approach.
>
> Thanks,
>
> p@rick
>
>   


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