[Ecn-sane] mosh ecn bits washed out

[Pete Heist]

Meaning, the negotiation succeeds and ECT(0) is set going up, but
zeroed on packets by the time they come down?

The negotiation can also be blocked with iptables --ecn-tcp-remove,
which just zeroes out ECE and CWR, preventing negotiation
(https://git.netfilter.org/iptables/tree/extensions/libipt_ECN.c), but
I doubt that's very commonly done.

On Thu, 2021-03-18 at 13:00 -0700, Dave Taht wrote:
> mosh, which has long had excellent support for ecn, appears to be
> getting the
> ecn bit washed out along my path from california to england.
> 
> ecn survives up that way, but not down.
> 
> Just a single data point thus far.
>