Vypress Chat between two LAN

hi,

I have two LAN network with two hotspots , i would like my user to comunicate each other by using Vypress Chat software , so please let me know that how i can do source /destination natting. Vypress chat using 8167 default port, and also let me know that, is it udp or tcp?? note: and i donot wanna share any other port between those two Different subneted Lan
Thanks
Waiting

Vypress chat is using multicast udp, as far as I know. So try using ROS v3 and PIM