As Normis points out http://forum.mikrotik.com/t/fasttrack-new-feature-in-6-29/87517/1
The idea is to “fasttrack” some specific machine without slowing it’s traffic for processing. Let’s say you have a network of users, you have firewall and queues for them. But then you have a VIP customer (or your own PC) that you will not filter or slow down, and you want the best available speed for it. This is the situation for fasttrack.
I would like to try this at home with a gaming console. If I understand the configuration correctly I can add:
/ip firewall filter add chain=forward action=fasttrack-connection connection-state=established,related
but wouldn’t this just apply to all connections? Is it possible to just FastTrack an IP or group of IPs? Maybe specific ports?
In my current setup I’ve got a console on x.x.x.200 nat’ted to ports 3074,88,500,3544 and 4500 (standard xbox-live ports).