// ADD DNS to your mac machine on CMD
sudo networksetup -setdnsservers Wi-Fi 8.8.8.8 8.8.4.4 185.228.168.9 208.67.222.222
// Change your mac hostname, pcname, localhostname
sudo scutil --set HostName <NEWMACHINENAME>
sudo scutil --set ComputerName <NEWMACHINENAME>
sudo scutil --set LocalHostName <NEWMACHINENAME>