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rtx-syn-ack-syn-rcvd-via-syn-sent.pkt
tuexen (Michael Tuexen)
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tuexen
May 31 2018, 11:58 AM
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rtx-syn-ack-syn-rcvd-via-syn-sent.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
--tolerance_usecs=2000000
--tcp_ts_tick_usecs=1000 /* one tick is a ms */
`sysctl -w net.inet.tcp.syncookies_only=0`
// The connection setup is limited by net.ipv4.tcp_syn_ack_retries, which is 5.
+00.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+00.000 fcntl(3, F_GETFL) = 0x02 (flags O_RDWR)
+00.000 fcntl(3, F_SETFL, O_RDWR | O_NONBLOCK) = 0
+00.000 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
+00.000 > S 0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 0 ecr 0>
+00.010 < S 0:0(0) win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 100 ecr 0>
+00.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 10 ecr 100>
+03.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 3010 ecr 100>
+03.200 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 6210 ecr 100>
+03.200 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 9410 ecr 100>
+03.200 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 12610 ecr 100>
+03.300 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 15810 ecr 100>
+06.200 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 22010 ecr 100>
+12.200 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 34210 ecr 100>
+24.200 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 58410 ecr 100>
+16.790 getsockopt(3, SOL_SOCKET, SO_ERROR, [ETIMEDOUT], [4]) = 0
+00.000 close(3) = 0

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