Wednesday, November 30, 2011

Wireshark Lab: UDP

1. Desination Port, Source Port, checksum, length
2. There are 13 header bytes
3. The total value is the 13 header bytes plus the 21 data bytes.
4. The max number of bytes is 65535-13 = 65522
5. The largest sourceport would be 65535
6. The protocol number is 17.

 7. The checksum is calculated by the 16 bit headers and data added together and they are checked against the key, 0xffff.
8. The destination port of the host packet is the same as the source port of the reply packet.


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