[Bloat] [Ecn-sane] The curious case of "cursed-ECN" steam downloads

Jonathan Morton chromatix99 at gmail.com
Sun Sep 3 18:36:03 EDT 2023


> On 3 Sep, 2023, at 9:54 pm, Sebastian Moeller via Ecn-sane <ecn-sane at lists.bufferbloat.net> wrote:
> 
> B) Excessive ECT(1) marking (this happened with a multi-GB download)

This *could* be a badly configured middlebox attempting to apply a DSCP, but clobbering the entire TOS byte instead of the (left justified) DSCP field.  Apparently Comcast just found a whole raft of these in their own network as part of rolling out L4S support.  Funny how they didn't notice them previously.

 - Jonathan Morton


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