DSCP Diffserve code point
- Priority markings on IP traffic.
- How to match with tcpdump ?
- for EF
- Take 101110 and shift it left two bits: 10111000 (ECN is right 2 bits)
- Convert it to hex: 0xb8
- Create a filter, masking out the ECN bits:
ip[1] & 0xfc == 0xb8
- for EF
...