DSCP and ECN

very nice feature IF your routers can handle it. you can use “ping -Q 0xB8” for testing VoIP traffic, or iperf.

important values are either 00h (default, best effort), or B8h (expedited forwarding, good for RTSP), and 68h (AF31, for SIP) – when ECN is set to 00 binary!

this table here sums it up quite nicely: