The SWBF instruction book is refering to hosting your games with your Ps2.
If you are running a PC dedicated server then you should foward those ports only to your PC. Where ever the server is running, thats where the ports should be fowarded.
The Mic issue is due to your Ps2 is connecting to the server on a LAN connection instead of over the internet. That is why your PING is so low in your own server, it routes the shortest, fastest route for the connection. I assume you could set up a static routing table on your router to force your Ps2 to connect to your server over the internet, but I haven't been able to figure quite how to do this yet. Hope the info helps, and see you on the battlefield.