Separate video bridge

hi everyone
i have installed jitsi prosody jicofo and jvb on one machine with turn server (which is nat configured with the public ip) and it works like a charm
now i have a machine with only jvb installed that is in private network with the default jitsi and i want to quit using the default jvb and the jvb on the second machine to host jvb
so do i need a second public ip for the second machine which hosts the jvb or is there any way that i can configure with the only public ip that the web is mapped to