I am using open source streaming server Red5 on multiple servers. Which are running behind a bastion host.

the world knows these sites as

http://site1.mydomain.com
http://site2.mydomain.com
http://site3.mydomain.com
http://site4.mydomain.com

To reach the front end server is using Apache Reverse Proxy.

I am also having video streaming on each of these websites using rtmp.

To be able to reach the streaming server I embed a javascript in HTML pages as follows Code:

<embed .....
var="rtmp://site1.my_domain.com"
>

the problem is the website are many

site1.mydomain.com
site2.mydomain.com
site3.mydomain.com
site4.mydomain.com

each on a separate physical server. Each of these four have their own Red5 installations the front end to each of these four is a common Bastion Host.

If I run rtmp on each of the subdomains at a different port

how will I make sure a request such as

rtmp://site1.mydomain.com
rtmp://site2.mydomain.com

goes to their respective servers. from the front end server. What do I need to handle in this case ?

IPTABLES came to mind instantly but from the client browser on internet when some one requests

rtmp://site1.mydomain.com

how will I make sure this rtmp request is mapped to a port different than 1935 as there are three other streaming servers which are also to respond to their respective requests ?