Xinetd example

$ cat /etc/xinetd.d/pop3

service pop3
{
    disable                 = no
    socket_type             = stream
    wait                    = no
    user                    = root
    server                  = /usr/sbin/ipop3d
    log_on_success          += USERID
    log_on_failure          += USERID
    only_from               = 127. 268.68.0.0/16 172.16.1.0/24
    no_access               = 172.16.1.15 172.16.1.18
    access_times            = 8:00-21:00
}