tc uint1
   rd uint1
   ra uint1
   uint3 = 0
}
</pre>
</div>
</td> <td  width="40%">
<div class="org-src-container">

<pre  class="src src-c">struct dns_header {
    uint16_t id;
    uint8_t qr;
    uint8_t opcode;
    uint8_t aa;
    uint8_t tc;
    uint8_t rd;
    uint8_t ra;
};
</pre>
</div>
</td></tr>
<tr> <td>

<pre class="example">
payload choose { 
   ICMP = &lt;uint16= 1; icmp&gt;   
   ARP = &lt;uint16= 0x0806; arpfour&gt; 
   IPFOUR = &lt;uint16= 0x0800; ipfour&gt;
}
</pre>
</td> <td>

<pre class