I have a home network consisting of 1 wireless router connected to the internet, and then a number of clients directly connected to it on both ethernet and wireless, as illustrated below:
All clients are on the same /24 net (192.168.1.0-255). On each device internet connectivity is working very well.
When I start streaming a movie from Netflix on PS3_1 (regular PS3), or even if I stream video locally, from NAS_1 (Synology DS207+), gaming between the LAPTOP's and the DESKTOP computers start lagging a lot (so bad you can't even enjoy a LAN game of WC3 or CS). Online gaming starts lagging too (only noticed it with Diablo 3 though).
How can I troubleshoot this? Can I inspect some traffic on the router maybe?
The WIFI router is a Zyxel P-2812HNU-F1