https://itmanual.net/lg-%ec%9c%a0%ed%94%8c%eb%9f%ac%ec%8a%a4-%ea%b3%b5%ec%9c%a0%ea%b8%b0-%ed%8f%ac%ed%8a%b8%ed%8f%ac%ec%9b%8c%eb%94%a9-dmz-%ec%84%a4%ec%a0%95-%eb%b0%a9%eb%b2%95/