Can I use Message Broker across different Networks

[prasad kulkarni]

Hi,

For a new project, I have to decide whether I should go with the ActiveMQ (or any other message broker ) or not.
My need is :
I have 2 secured & different networks. A machine in one n/w can SFTP to the other machine of other n/w.
I have a choice to use files for communication using SFTP . However I want to go for JMS. I do not think file handling as a robust way to achieve my task.
I want to know,
1] Can I use - only one broker instance in one network and the processes running on other network will subscribe to the queues of this only one broker instance?
2] Is there specific protocol I have to use?
3] Do I have to check/edit any specific setting (as port or protocol) from the network administration team?