On 10/30/25 3:34 PM, chia-yu.chang@nokia-bell-labs.com wrote:
From: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com
Enable Accurate ECN negotiation and request for incoming and outgoing connection by setting sysctl_tcp_ecn:
+==============+===========================================+ | | Highest ECN variant (Accurate ECN, ECN, | | tcp_ecn | or no ECN) to be negotiated & requested | | +---------------------+---------------------+ | | Incoming connection | Outgoing connection | +==============+=====================+=====================+ | 0 | No ECN | No ECN | | 1 | ECN | ECN | | 2 | ECN | No ECN | +--------------+---------------------+---------------------+ | 3 | Accurate ECN | Accurate ECN | | 4 | Accurate ECN | ECN | | 5 | Accurate ECN | No ECN | +==============+=====================+=====================+
Refer Documentation/networking/ip-sysctl.rst for more details.
Signed-off-by: Chia-Yu Chang chia-yu.chang@nokia-bell-labs.com
Acked-by: Paolo Abeni pabeni@redhat.com