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// Test behavior when a listener gets an incoming packet that has
// the ACK bit set but not the SYN bit set.
0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
0.000 bind(3, ..., ...) = 0
0.000 listen(3, 1) = 0
0.100 < . 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
0.100 > R 0:0(0) win 0
// Now make sure that when a valid SYN arrives shortly thereafter
// (with the same address 4-tuple) we can still successfully establish
// a connection.
0.200 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
0.200 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 6>
0.300 < . 1:1(0) ack 1 win 320
0.300 accept(3, ..., ...) = 4
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