I'll be running a Java application on thousands of machines, which machines I am assuming will be sitting behind a firewall. I need my web server to push commands to this application at will. I don't want to the machine to periodically heartbeat to get tasks.
When the application starts up, I want it to initiate a connection to my web server. From my current understanding, the router will automatically use port address translation to understand which machine behind the firewall the original message came from. The router will send a message to the web server with the request and a randomly generated port for the server to respond back on. The server will then send a response back on that random port, the router will receive the response, know which machine is tied to the request (using the random port as the key), and then forward to response to that particular machine. I want to do some fancy magic with this whole process, where my web server will actually record the port that the original request came through on and then use that port to send data back as needed. Essentially I want to open up persistent HTTP connection in order to circumvent any firewall that may be in place. Is this even possible? =] Kirk Ouimet [email protected] Cell: (801) 310-1421 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kyle Waters Sent: Wednesday, June 10, 2009 2:19 PM Cc: 'uphpu' Subject: Re: [UPHPU] Bi-directional Communication Through a Firewall Kirk Ouimet wrote: > Thanks for the response - unfortunately I won't have access to configure the > firewall so I'm looking for a workaround. Something like HTTP tunneling... > Let me make sure I understand what you are trying to do. You want to set up a web server, running a webapp inside of a network with a router that you don't control, and can't get changed? I'm not sure you understand the issue fully yet. In order for someone to connect to a web server there must be an unfirewalled public ip for them to connect to. So even if you use "HTTP tunneling" you still need a server on the out side to connect to. If you have a server on the out side why not just put the app there? You may want to look into westhost($5/month), xmission($10/month), or linode($20/month). See which one best fits your needs and do that. Or if you are really nice one of us my give you an account you can play around on ;) Kyle _______________________________________________ UPHPU mailing list [email protected] http://uphpu.org/mailman/listinfo/uphpu IRC: #uphpu on irc.freenode.net
_______________________________________________ UPHPU mailing list [email protected] http://uphpu.org/mailman/listinfo/uphpu IRC: #uphpu on irc.freenode.net
