Hi. all we know that we can tether 3G connection via usb and bluetooth. sometimes i need to add DNS numbers to my airport or ethernet connections. but when i use USB tethering there is no option to add DNS or any other settings. If i connect via bluetooth, there is option menu. but bluetooth speed is limited almost 90 kb/s. so Bluetooth is slower than USB. But as i said there is no option at system preferences->Network when connected via USB. isn't there anyway to add DNS when connected via USB?