Finally I got it working. The problem was, that I rejected registration because of the private IP. When I allowed the registration with private IP, everything worked fine. I still have a question: why there is not possible to use the public IP? What if two private IPs are the same (they are not unique on the internet and many times it's not easy to solve such situation). Regards, Thomas Tuesday, March 2, 2004, 3:07:51 PM, Thomas wrote: T> Hello, T> could anybody explain how does Citron's NAT technology work? What T> should be set up in GK behind NAT firewall, in GK with public IP and T> also what requirements are stated for firewall. T> As I underestood the topology has to look like: T> gw - GK1 ~~~ NAT FW ~~~~ GK2 ---- gw T> where GK1 is registered under GK2 (if I'm right). T> Thanks in advance, T> Thomas ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/