rlogin

Opens ports between 512-514

Service	Port	Protocol
rcp	514	TCP
rexec	512	TCP
rlogin	513	TCP
rsh	514	TCP
rstat		UDP
ruptime	513	UDP
rwho	513

Please note

rlogin doesn't return any message when connection is successful
rlogin and rsh use /etc/hosts.equiv and $HOME/.rhosts
rlogin uses rlogind; rsh uses rshd as a daemon

hosts.equiv and .rhosts format

host1
host2 user_v
-host3
+@group1 -user_c
-@group2

The traffic transmitted is unencrypted. The login process is without a password. This is blocked on modern systems

The traffic can be intercepted and spoofed.

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