Hi Jonathan
On 4 September 2023 00:36:03 CEST, Jonathan Morton <[email protected]>
wrote:
>> On 3 Sep, 2023, at 9:54 pm, Sebastian Moeller via Ecn-sane
>> <[email protected]> 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.
[SM] Mmmh, would that likely be DSCP decimal 1, aka LE? Or someone mapping e.g.
a 3bit VLAN priority PCP directly onto the TOS field? What puzzles me is that
from the same IPv6 I got one more data flow, 182 MB using ECT(0) and ECN...
odd...
>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.
[SM] In retrospect re-dedicating bits out of an already used header field might
have been a bit optimistic....
Regards
Sebastian
>
> - Jonathan Morton
--
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