To reuse an SSH link, you have to build SSH configuration file. Then, any time you make SSH relationship, Openssh tends to make use of the configuration file to create the link. The directive UseDNS controls this certain behaviour of OpenSSH, and although it is actually commented in sshd_config (that's https://vpnandsoftetheraccount39493.blogripley.com/32288344/the-fact-about-speedssh-that-no-one-is-suggesting