// Test reorder pkts received out of order, receiver sending correct ACK.

// Establish a connection.
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  < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
+0  > S. 0:0(0) ack 1 <...>

+.1 < . 1:1(0) ack 1 win 32792
+0  accept(3, ..., ...) = 4

// receive 3 pkts out of order
+0 < . 1:1001(1000) ack 1 win 32792
+0 > . 1:1(0) ack 1001
+0 < . 2001:3001(1000) ack 1 win 32792
+0 > . 1:1(0) ack 1001

+0.1 < . 1001:2001(1000) ack 1 win 32792
// reorder pkts and ack them
+0.1 ~ +0.2 > . 1:1(0) ack 3001

// read received data
+0 read(4, ..., 3000) = 3000