https://blog.faceutil.com/2020/07/29/telnet-putty-%eb%ac%b4%ec%84%a4%ec%b9%98-%eb%b2%84%ec%a0%84-%ed%95%9c%ea%b8%80%ea%b9%a8%ec%a7%88%eb%95%8c-%eb%8c%80%ec%b2%98%eb%b2%95-%d1%8e/