| // Test SYN/ACK rexmit triggered 3rd ACK duplicate + CE on first data seg |
| |
| `./defaults.sh |
| sysctl -q net.ipv4.tcp_ecn=3 |
| ` |
| |
| 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 |
| +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 |
| +0 bind(3, ..., ...) = 0 |
| +0 listen(3, 1) = 0 |
| |
| +0 < SEWA 0:0(0) win 32792 <mss 1050,nop,nop,sackOK,nop,wscale 8> |
| +.002 > SW. 0:0(0) ack 1 <mss 1460,ECN e1b 1 ceb 0 e0b 1,nop,nop,nop,sackOK,nop,wscale 8> |
| |
| // SYN/ACK rexmitted => two 3rd ACKs in-flight |
| +1.0~+1.1 > SW. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> |
| // Delivered 1st 3rd ACK |
| +0.05 < [ect0] W. 1:1(0) ack 1 win 257 <ECN e0b 1 ceb 0 e1b 1,nop> |
| +.002 accept(3, ..., ...) = 4 |
| |
| // Duplicate 3rd ACK delivered |
| +1.05 < [ect0] W. 1:1(0) ack 1 win 257 <ECN e0b 1 ceb 0 e1b 1,nop> |
| |
| +0.05 < [ce] EAP. 1:1001(1000) ack 1 win 257 <ECN e0b 1 ceb 0 e1b 1,nop> |
| +.002 > [ect0] WA. 1:1(0) ack 1001 <ECN e1b 1 ceb 1000 e0b 1,nop> |
| +0 read(4, ..., 1000) = 1000 |
