PC IP : 192.168.11.5 O/S : Windows XP SP3 Firewall : none, and I turn off my PC's firewall already. N900 IP : 192.168.11.6 Router : Buffalo WZR2-G300N, and I didn't see firewall or restrictions settings, gust mode?? what's that?? , my router security use WPA-PSK(TKIP).