If I mark a packet at a edge location with DSCP, does anyone know if ISPS (or in a general sense, middleboxes) strip or modify the DSCP header on UDP packets before they reach another edge location? Most interesting to me is residential to residential.
EDIT: I don't expect the ISP to honor them (Netflix, why didn't you just mark your packets? /sarcasm); I just hope the packets remain unmodified from edge-to-edge.
I'd be interested in answers such as:
- I've seen it before, but I have no idea how widespread it is
- It happens a large percentage (> 10%)
- It does not happen much (< 10%)
- Rare (< %1)
I know this question is awfully hard to answer unless you have tried to do this, but I figured I'd ask.