The 6th gen is the 128-bit era, this is the time of the ps2, xbox, game cube and sega dreamcast, there was apperintly another console called the XaviXPort but i never heard of it. This era ended arounf 2005 when the xbox 360 came out.
The multiplayer mode for MGS3. No idea if the servers are still online though.
i dont think it is still runing, i would loved to have played it but the damn ps2 was so hard to get to play online i never did :(
the servers are closed, but msg4 online is pretty much the same.