1// Test AccECN with sysctl set to server-side only 2 3`./defaults.sh 4sysctl -q net.ipv4.tcp_ecn=5 5` 6 7 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 8 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 9 +0 bind(3, ..., ...) = 0 10 +0 listen(3, 1) = 0 11 12 +0 < SEWA 0:0(0) win 32792 <mss 1050,nop,nop,sackOK,nop,wscale 8> 13+.002 > SW. 0:0(0) ack 1 <mss 1460,ECN e1b 1 ceb 0 e0b 1,nop,nop,nop,sackOK,nop,wscale 8> 14+0.05 < [ect0] W. 1:1(0) ack 1 win 320 <ECN e0b 1 ceb 0 e1b 1,nop> 15+.002 accept(3, ..., ...) = 4 16 17+0.01 write(4, ..., 1000) = 1000 18+.002 > [ect0] EAP. 1:1001(1000) ack 1 <ECN e1b 1 ceb 0 e0b 1,nop> 19