Use
rlogin is most commonly deployed on corporate or academic networks, where user account information is shared between all the Unix machines on the network (often using NIS). These deployments essentially trust ALL other machines (and the network infrastructure itself) and the rlogin protocol relies on this trust. rlogind allows logins without password (where rlogind trusts a remote rlogin client) if the remote host appears in the /etc/hosts.equiv file, or if the user in question has a .rhosts file in their home directory (which is frequently shared using NFS).
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