How to implement CORBA client behind NAT

Question

I have following interfaces.

interface Server {
   void subscribe(in Client client);
};

interface Client {
   void ping();
   void pong();
};

Answer 1

Find out if your ORB supports bi-directional IIOP, that solves the NAT/firewall issue for server->client callbacks.

Here are some ORBs that do support it:

OmniORB - http://omniorb.sourceforge.net/omni40/omniORB/omniORB008.html#sec:bidir

Orbix - http://documentation.progress.com/output/Iona/orbix/migration/html/InteropCx3.html

Visibroker - http://www.albany.edu/dept/csi/csi518/fall03/inprise/vbroker/doc/books/vbj/vbj45/programmers-guide/bidir.html