How can I turn on ECN for Mac OSX?

Question

I'd like to run some networking tests with Mac OSX 10.8 and using the ECN option. However I cannot find any documentation on how to configure it.

Does anybody know how to alter Mac OSX TCP networking options?

Answer 1

After a quick searching I´ve found the following wikipedia entry which suggests the following sysctl settings:

net.inet.tcp.ecn_negotiate_in

net.inet.tcp.ecn_initiate_out

You could set these up with:

sudo sysctl -w net.inet.tcp.ecn_negotiate_in=1
sudo sysctl -w net.inet.tcp.ecn_initiate_out=1

These setting will disappear after reboot.