DNS: Difference between revisions
→DNS Headers
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= DNS Headers =
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{| class="wikitable" style="margin: 0 auto; text-align:center; width:80%;"
|+TCP Header
|-
| colspan="16"| Source port || colspan="16"| Destination port
|-
| colspan="32"| Sequence number
|-
| colspan="32"| Acknowledgment number (if <tt>ACK</tt> set)
|-
| colspan="4"| Data offset || colspan="3"| Reserved<br><tt>'''0 0 0'''</tt> || cellpadding="1"|<tt>N<br>S</tt>|||<tt>C<br>W<br>R</tt>|||<tt>E<br>C<br>E</tt>|||<tt>U<br>R<br>G</tt>|||<tt>A<br>C<br>K</tt>|||<tt>P<br>S<br>H</tt>|||<tt>R<br>S<br>T</tt>|||<tt>S<br>Y<br>N</tt>|||<tt>F<br>I<br>N</tt>|| colspan="16"| Window Size
|-
| colspan="16"| Checksum || colspan="16" | Urgent pointer (if <tt>URG</tt> set)
|-
| colspan="32" style="background:#ffd0d0;"| Options (if ''data offset'' > 5. Padded at the end with "0" bytes if necessary.)<br />...
|}
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{| class="wikitable" style="margin: 0 auto; text-align:center; width:80%;"
|+DNS Header
|-
| colspan="16"| Identification || colspan="16"| Destination port
|-
| colspan="16"| Total Questions || colspan="16"| Total Answers
|-
| colspan="16"| Total Authority Resource Records || colspan="16"| Total Additional Resource Records
|}
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