after a whole day of messing around network sharing, i can't for the life of me figure out why it disconnects when playing a game on the 360.
first it disconnects via the dashboard when idle, i messed around with the local network settings till i fixed it but now whenever i play a game it will disconnects after 3 or 5 min of idle.
finally, after giving up with network sharing i decided to try to bridge the two connections (pc + 360) and it worked, no more disconnecting when idle while on dash or playing games and the nat is even open.

bridge connections