//
// Copyright (c) 2018 Michael Tuexen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//

--ip_version=ipv4

 0.00 `sysctl -w net.inet.tcp.hostcache.purgenow=1`
+0.00 `sysctl -w net.inet.tcp.syncookies_only=0`
+0.00 `sysctl -w net.inet.tcp.syncookies=1`
+0.00 `sysctl -w net.inet.tcp.rfc1323=1`
+0.00 `sysctl -w net.inet.tcp.sack.enable=1`
+0.00 `sysctl -w net.inet.tcp.ecn.enable=2`
// Enable server side of TCP fast open.
+0.00 `sysctl -w net.inet.tcp.fastopen.server_enable=1`
+0.00 `sysctl -w net.inet.tcp.fastopen.acceptany=1`

// Create a listening TCP socket
+0.00 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0.00 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0.00 setsockopt(3, IPPROTO_TCP, TCP_FASTOPEN, [1], 4) = 0
+0.00 bind(3, ..., ...) = 0
+0.00 listen(3, 2) = 0
// Establish the connection
+0.10 < S     0:100(100) win 65535 <mss 1460,sackOK,FO 0000000000000000>
+0.00 accept(3, ..., ...) = 4
+0.00 close(3) = 0
+0.00 recv(4, ..., 1000, 0) = 100
+0.00 send(4, ..., 200, 0) = 200
+0.00 > S.    0:200(200) ack 101 win 65535 <mss 1460,sackOK,FO 0000000000000000>
+0.00 send(4, ..., 200, 0) = 200
// Initiate the teardown of the connection.
+0.00 close(4) = 0
+0.10 <  .  101:101(0) ack 201 win 65535
+0.00 > FP. 201:401(200) ack 101 win 65535
+0.10 < F.  101:101(0) ack 402 win 32767
+0.00 >  .  402:402(0) ack 102 win 65535
+0.00 `sysctl -w net.inet.tcp.fastopen.acceptany=0`