Differences between revisions 1 and 2
⇤ ← Revision 1 as of 2010-09-24 21:09:42 →
Size: 392
Editor: PieterSmit
Comment: Create
← Revision 2 as of 2010-09-24 21:10:54 → ⇥
Size: 396
Editor: PieterSmit
Comment:
Deletions are marked like this. Additions are marked like this.
Line 11: Line 11:
     1 Take 101110 and shift it left two bits: 10111000
     1 Convert it to hex: 0xb8
     1 Create a filter, masking out the ECN bits:
     * ip[1] & 0xfc == 0xb8		      1. Take 101110 and shift it left two bits: 10111000
     1. Convert it to hex: 0xb8
     1. Create a filter, masking out the ECN bits:
      * ip[1] & 0xfc == 0xb8

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
      2. Convert it to hex: 0xb8
      3. Create a filter, masking out the ECN bits:

        • ip[1] & 0xfc == 0xb8

...

dscp (last edited 2010-09-24 21:11:25 by PieterSmit)