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client-use-min-mtu-before-connect-ipv4.pkt
tuexen (Michael Tuexen)
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tuexen
Aug 18 2018, 7:50 PM
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client-use-min-mtu-before-connect-ipv4.pkt
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//
// 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_mapped_ipv6
// 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.rfc1323=1`
+0.00 `sysctl -w net.inet.tcp.sack.enable=1`
+0.00 `sysctl -w net.inet.tcp.ecn.enable=2`
+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 setsockopt(3, IPPROTO_IPV6, IPV6_USE_MIN_MTU, [1], 4) = 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 32767 <mss 1460,sackOK,eol,eol>
+0.00 > . 1:1(0) ack 1 win 65535
+0.00 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
+0.00 getsockopt(3, IPPROTO_IPV6, IPV6_USE_MIN_MTU, [1], [4]) = 0
+0.00 getsockopt(3, IPPROTO_TCP, TCP_MAXSEG, [1460], [4]) = 0
+0.10 send(3, ..., 1500, 0) = 1500
+0.00 > . 1:1461(1460) ack 1 win 65535
+0.00 > P. 1461:1501(40) ack 1 win 65535
+0.05 < . 1:1(0) ack 1501 win 65535
+0.10 < F. 1:1(0) ack 1501 win 65535
+0.00 > . 1501:1501(0) ack 2 win 65535
+0.00 close(3) = 0
+0.00 > F. 1501:1501(0) ack 2 win 65535
+0.05 < . 2:2(0) ack 1502 win 65535

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