Hey there! If you're setting up port forwarding on your router for internet matches with your friends, there's actually a hidden parameter on the hosting command in which you can add a custom port number.
When you begin to host a match add an extra parameter for your desired port number.
#Syntaxes
host <Room-name> <Max-Connecting -players> <Custom-Port-Number>
connect <Host-IP-Address> <Custom-Port-Number>
Example:
#Using the console command (F1) - You, as the host.
"host This_is_my_match 3 1232"
Then your friends can now connect using the command "connect" and add an extra parameter for your port number.
Example:
#Using the console command(F1) - Connecting friends.
"connect xxx.xxx.xxx.xxx 1232"
Replace the x's with your public IP in which you must provide to your connecting friends.
Note: Do not include the double quotes.
Note: Parameters are split/delimited by white spaces.
Disclaimer: Yet it is technically possible, I do not recommend internet matches since that portion of the game has not yet been optimized.
Thank You and looking forward to your feedback. :)