Playing on GTADS without port forwarding?
That's right, I thought it over and I think I will be implementing a NAT friendly proxy for GTADS players. This will allow users to only join games but anyone interested in hosting will still need to open their proxy port. While this isn't implemented yet I do warn that the in using 1 port traffic it is still recommended that you would open your proxy port for optimal game play. Users may experience a little extra lag against players who do not have their proxy port forwarded. I also wouldn't advice voice chat off of these sessions but some more testing will confirm how much performance is affected. This should be in development within a couple of days and featured in Release 1.13.