서버 reset 방법

1) dns-nameservers 168.126.63.1 #KT DNS 서버

2) service vpnclient stop

3) sudo rm /etc/resolveconf/resolve.conf.d/tail

4) service networking restart

5) 재부팅

6) /etc/network/interfaces : <서버주소>로 서버주소변경

# dev error가 날 경우 

sudo etc/hosts 에서 127.0.0.1 dev147 추가