192.168.1.1->Configuration->WAN connections->edit 'yoon-0'->Edit Ip Interface->MTU (set to 1492)->Save config-> reboot modemIn the registy you need to find your nic...i would suggest using a program called drtcp or if your comfortable with regeditHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{xxxxxx-xxxxx-xxxxxx-xxxxx}there shoudl be a number of those interfaces you need to find which one is used by your NIC, look at the IPAddress key & NameServer keys and if they match the ones you see by doing an ipconfig /all ....then you got the right interface. Now look for MTU key and set it to 1492 and then reboot pc.