set policy-options prefix-list NETWORK/24
    policy-options {
        prefix-list telnet-ssh-sessions {
        NETWORK/24;
    }
}

firewall {
    filter re-filter {
        term police-ssh {
            from {
                source-prefix-list {
                    telnet-ssh-sessions;
                    }
            protocol tcp;
            port [ ssh telnet ];
            tcp-initial;
            }
        then {
            policer 1m-bw-limit;
            accept;
        }
    }
}

Related posts:

1. First steps configuring Juniper Routers
2. Route servers