File: tcp.ferm

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ferm 2.7-2
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chain INPUT {
    proto tcp dport 22 ACCEPT;
    proto tcp dport ! 22 DROP;
    proto tcp {
        tcp-flags (SYN FIN RST) SYN DROP;
        tcp-flags ! (SYN RST) RST ACCEPT;
        tcp-flags ! RST RST REJECT;
        syn REJECT;
        !syn ACCEPT;
        tcp-option 2 ACCEPT;
        tcp-option ! 3 DROP;
        tcp-option (4 5) REJECT;
        mss 100:200 DROP;
    }
}