Unfortunately it's a little more complex than port numbers. The port and packet headers come in to play. We can't prioritise all packets on port 443 for example as this is the default port for all https traffic, and 5223 is used by Apple for all notifications. People often assume that QoS is simply a matter of rate limiting ports and packets but it's far more complex in that the priorities as to how each packet enters and importantly EXITS a funnel in the QoS pools is vital.
In this case if it's peer-to-peer traffic it will assign it a low priority in that specific peer-to-peer pool. If it's on port 443 it makes it a little more complicated as we have mechanisms to attempt to put a stop to circumvention of default shaping policies on SSL traffic. In your case it may in fact be a discovery issue on udp ports rather than a tcp issue.
What you'll need to do is schedule some time with our network bloke who, with your permission, will monitor your connection during a game to see the traffic passing through on the required ports to see how it's passing through and if there are any issues. If there are no issues then it may in fact be other users on your network who have port forwarding issues. For example if another user or their ISP is blocking that specific traffic on UDP 3478 you won't be able to "discover" them and you'll not see them nor hear them in-game.
I'm unfortunately not a gamer (no Sinbad, I'm not
) and I'm not a network engineer either, so I'll have to get you on with the right guys at the right time to test this.
We just don't have the mechanisms to put together a gaming testing centre to monitor this traffic. Perhaps once we launch and you've all referred your brothers, aunties, uncles and friends,
we'll look at setting aside a budget for this and employ a full-time gamer with a decent networking background to specifically prioritise gaming as a whole. Or we'll work with the MyGaming community to help out.
For now, our focus is on getting the core network running smoothly for as many users as possible, and thereafter we'll look into the finer specifics.
But bottom line is get in touch with support, ask them to refer your ticket to Shaun, and I'll arrange for you and the networking blokes to talk to see what we can do in the interim.
