I should note that I haven't evaluated ECN marks, just that 45 gets
passed to/fro
Bob
[JL] Quite true: each network tends to use DSCP marks on a
private/internal basis and so will bleach the DSCP marks on ingress
from peers. This will, however, change with the upcoming IETF RFC on
Non-Queue-Building (NQB) Per Hop Behavior -
https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-nqb. And I can
report that we at Comcast now permit DSCP-45 inbound for NQB packets,
in case developers would like to experiment with this (we just
finished updating router configs last week for residential users on
DOCSIS; FTTP and commercial are still in process).
iperf 2 now supports a --dscp option as a convenience (vs setting the
--tos byte.) I can confirm --dscp 45 is being passed over my xfinity
hop to my linodes (now Akamai) servers in both directions at multiple
colo locations.
The --dscp is in the master branch.
https://sourceforge.net/p/iperf2/code/ci/master/tree/ Older versions
require --tos and setting the byte, e.g. 180
Bob
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