In case you are employing macOS SSH are going to be up to date with your technique up grade, this means you don’t have to worry about it. The directive UseDNS controls this particular conduct of OpenSSH, and although it is commented in sshd_config (which is the default configuration file https://free-v2ay-vmess-vless-ser83837.blog5star.com/32092017/speedssh-options