On Wed, Jan 21, 2026 at 3:32 PM <[email protected]> wrote: > > From: Chia-Yu Chang <[email protected]> > > Based on specification: > https://tools.ietf.org/id/draft-ietf-tcpm-accurate-ecn-28.txt > > Based on Section 3.1.5 of AccECN spec (RFC9768), a TCP Server in > AccECN mode MUST NOT set ECT on any packet for the rest of the connection, > if it has received or sent at least one valid SYN or Acceptable SYN/ACK > with (AE,CWR,ECE) = (0,0,0) during the handshake. > > In addition, a host in AccECN mode that is feeding back the IP-ECN > field on a SYN or SYN/ACK MUST feed back the IP-ECN field on the > latest valid SYN or acceptable SYN/ACK to arrive. > > Signed-off-by: Chia-Yu Chang <[email protected]> >
Reviewed-by: Eric Dumazet <[email protected]>
