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= DSCP Diffserve code point =
 * Priority markings on IP traffic.


 * How to match with tcpdump ?
   * for EF
     1. Take 101110 and shift it left two bits: 10111000 (ECN is right 2 bits)
     1. Convert it to hex: 0xb8
     1. Create a filter, masking out the ECN bits:
      * ip[1] & 0xfc == 0xb8
...