Apple Macintosh
Mac OS X 10.5 and 10.6 implements ECN support for TCP. It is controlled using the following boolean sysctl variables:
net.inet.tcp.ecn_negotiate_in
net.inet.tcp.ecn_initiate_out
The first enables ECN on incoming connections that already have ECN flags set; the second tries to initiate outgoing connections with ECN enabled. Both variables default to 0, but can be set to 1 to enable the respective behavior:
sysctl -w net.inet.tcp.ecn_negotiate_in=1
sysctl -w net.inet.tcp.ecn_initiate_out=1
To make the settings persistent, put following lines in /etc/sysctl.conf:
net.inet.tcp.ecn_initiate_out=1
net.inet.tcp.ecn_negotiate_in=1
Read more about this topic: Explicit Congestion Notification, Implementations, ECN Support in TCP By Hosts
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