1// Test that tcp_ecn=4 uses RFC3168 ECN for SYN 2 3`./defaults.sh 4sysctl -q net.ipv4.tcp_ecn=4 5` 6 7 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4 8+.002 ... 0.05 connect(4, ..., ...) = 0 9 10+.002 > SEW 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8> 11+0.05 < S. 0:0(0) ack 1 win 32767 <mss 1460,nop,nop,sackOK,nop,wscale 8> 12+.002 > . 1:1(0) ack 1 13