//
// Copyright (c) 2019 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

// Ensure that all relevant sysctl variables have their default values.
 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`
+0.00 `sysctl -w net.inet.tcp.initcwnd_segments=10`
+0.00 `sysctl -w net.inet.tcp.rfc3465=1`
// Set problem specific sysctl variables.
+0.00 `kldload -n cc_cdg`
+0.00 `sysctl net.inet.tcp.cc.algorithm=cdg`
+0.00 `sysctl net.inet.tcp.cc.cdg.smoothing_factor=0`
// First setup a TCP connection.
+0.00 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0.00 fcntl(3, F_GETFL) = 0x02 (flags O_RDWR)
+0.00 fcntl(3, F_SETFL, O_RDWR | O_NONBLOCK) = 0
+0.00 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
+0.00 > S    0:0(0)             win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 100 ecr 0>
+0.05 < S.   0:0(0)     ack   1 win 65535 <mss 1460,sackOK,eol,eol>
+0.00 >  .   1:1(0)     ack   1 win 65535
// Perform data transfer.
+1.00 write(3, ..., 100) = 100
+0.00 > P.   1:101(100) ack   1 win 65535
+0.05 <  .   1:1(0)     ack 101 win 65535
// Perform another data transfer.
+1.00 write(3, ..., 100) = 100
+0.00 > P. 101:201(100) ack   1 win 65535
+0.05 <  .   1:1(0)     ack 201 win 65535
// Teardown TCP connection.
+0.00 < F.   1:1(0)     ack 201 win 65535
+0.00 >  . 201:201(0)   ack   2 win 65535
+0.00 close(3) = 0
+0.00 > F. 201:201(0)   ack   2 win 65535
+0.05 <  .   2:2(0)     ack 202 win 65535