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rtx-syn-ack-syn-rcvd-via-listen.pkt

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tuexen
May 31 2018, 11:58 AM
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rtx-syn-ack-syn-rcvd-via-listen.pkt

//
// 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=100000
--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.inet.tcp.syncache.rexmtlimit, which is 3 times.
+00.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+00.000 bind(3, ..., ...) = 0
+00.000 listen(3, 1) = 0
+00.000 < S 0:0(0) ack 1 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 3000 ecr 100>
+03.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 6000 ecr 100>
+03.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 9000 ecr 100>
+03.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,nop,wscale 6,sackOK,TS val 12000 ecr 100>
+06.400 close(3) = 0

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