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Date: Wed, 29 Aug 2001 19:53:02 -0600
From: Val Henson <val@nmt.edu>
To: "David S. Miller" <davem@redhat.com>
Cc: kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org
Subject: Re: tcp connection hangs on connect
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On Wed, Aug 29, 2001 at 05:55:37PM -0700, David S. Miller wrote:
>    
> Without full and accurate tcpdump traces, your guess is as good as
> ours.

:) I was hoping Alexey would respond with "Oh yeah, here's that patch,
Dave please accept it."

Full tcpdumps from both hosts are at the end of this email.
198.17.100.42 is a 2.2.19 machine trying to scp a file from
198.17.100.41, running 2.4.10-pre2.  Here's the interesting bit:

18:23:18.980000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 16338:17786(1448) ack 1473 win 8216 <nop,nop,timestamp 18540 456453> (DF) [tos 0x8]
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540> (DF) [tos 0x8]
18:23:19.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 19234:20682(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8]
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 1 {19234:20682} > (DF) [tos 0x8]

Everything's fine till here, when 198.17.100.42 misses the 17787-19234
segment.  198.17.100.41 never retransmits this segment.

18:23:19.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 22130:23578(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8]
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 2 {22130:23578}{19234:20682} > (DF) [tos 0x8]
18:23:19.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 23578:25026(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8]
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 2 {22130:25026}{19234:20682} > (DF) [tos 0x8]

Long pause, eventually I kill the scp process.  Note the lack of a
retransmit of the 17787-19234 segment.

To reproduce:

As the very first TCP connection after a reboot, try to scp a large
file from the 2.4.x machine.

-VAL

Full tcpdump from 198.17.100.42's point of view:

18:23:15.740000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: S 3061649587:3061649587(0) win 32120 <mss 1460,sackOK,timestamp 456129 0,nop,wscale 0> (DF)
18:23:15.740000 eth0 B arp who-has 198.17.100.42 tell 198.17.100.41
18:23:15.740000 eth0 > arp reply 198.17.100.42 (0:30:65:ba:84:e6) is-at 0:30:65:ba:84:e6 (0:80:f6:10:50:26)
18:23:15.740000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: S 2117491474:2117491474(0) ack 3061649588 win 5792 <mss 1460,sackOK,timestamp 18215 456129,nop,wscale 0> (DF)
18:23:15.740000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1:1(0) ack 1 win 32120 <nop,nop,timestamp 456129 18215> (DF)
18:23:15.760000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1:26(25) ack 1 win 5792 <nop,nop,timestamp 18217 456129> (DF)
18:23:15.760000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1:1(0) ack 26 win 32120 <nop,nop,timestamp 456131 18217> (DF)
18:23:15.760000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1:25(24) ack 26 win 32120 <nop,nop,timestamp 456131 18217> (DF)
18:23:15.760000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 26:26(0) ack 25 win 5792 <nop,nop,timestamp 18217 456131> (DF)
18:23:15.760000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 26:666(640) ack 25 win 5792 <nop,nop,timestamp 18217 456131> (DF)
18:23:15.760000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 25:657(632) ack 666 win 31856 <nop,nop,timestamp 456131 18217> (DF)
18:23:15.790000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 666:666(0) ack 657 win 6952 <nop,nop,timestamp 18221 456131> (DF)
18:23:15.790000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 657:673(16) ack 666 win 31856 <nop,nop,timestamp 456134 18221> (DF)
18:23:15.790000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 666:666(0) ack 673 win 6952 <nop,nop,timestamp 18221 456134> (DF)
18:23:15.810000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 666:946(280) ack 673 win 6952 <nop,nop,timestamp 18222 456134> (DF)
18:23:15.830000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 673:673(0) ack 946 win 31856 <nop,nop,timestamp 456138 18222> (DF)
18:23:15.910000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 673:945(272) ack 946 win 31856 <nop,nop,timestamp 456146 18222> (DF)
18:23:15.940000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 946:946(0) ack 945 win 8216 <nop,nop,timestamp 18236 456146> (DF)
18:23:16.080000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 946:1522(576) ack 945 win 8216 <nop,nop,timestamp 18249 456146> (DF)
18:23:16.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 945:945(0) ack 1522 win 31856 <nop,nop,timestamp 456165 18249> (DF)
18:23:16.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1522:1538(16) ack 945 win 8216 <nop,nop,timestamp 18251 456165> (DF)
18:23:16.120000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 945:945(0) ack 1538 win 31856 <nop,nop,timestamp 456167 18251> (DF)
18:23:16.220000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 945:961(16) ack 1538 win 31856 <nop,nop,timestamp 456177 18251> (DF)
18:23:16.220000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 1538:1538(0) ack 961 win 8216 <nop,nop,timestamp 18263 456177> (DF)
18:23:16.220000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 961:1009(48) ack 1538 win 31856 <nop,nop,timestamp 456177 18263> (DF)
18:23:16.220000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 1538:1538(0) ack 1009 win 8216 <nop,nop,timestamp 18263 456177> (DF)
18:23:16.220000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1538:1586(48) ack 1009 win 8216 <nop,nop,timestamp 18263 456177> (DF)
18:23:16.230000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1009:1073(64) ack 1586 win 31856 <nop,nop,timestamp 456178 18263> (DF)
18:23:16.260000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1586:1650(64) ack 1073 win 8216 <nop,nop,timestamp 18267 456178> (DF)
18:23:16.280000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1073:1073(0) ack 1650 win 31856 <nop,nop,timestamp 456183 18267> (DF)
18:23:18.320000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1073:1233(160) ack 1650 win 31856 <nop,nop,timestamp 456387 18267> (DF)
18:23:18.320000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1650:1682(32) ack 1233 win 8216 <nop,nop,timestamp 18474 456387> (DF)
18:23:18.330000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1233:1297(64) ack 1682 win 31856 <nop,nop,timestamp 456388 18474> (DF)
18:23:18.330000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1682:1730(48) ack 1297 win 8216 <nop,nop,timestamp 18474 456388> (DF)
18:23:18.330000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1297:1377(80) ack 1730 win 31856 <nop,nop,timestamp 456388 18474> (DF) [tos 0x8] 
18:23:18.330000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1730:1778(48) ack 1377 win 8216 <nop,nop,timestamp 18474 456388> (DF) [tos 0x8] 
18:23:18.330000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1377:1425(48) ack 1778 win 31856 <nop,nop,timestamp 456388 18474> (DF) [tos 0x8] 
18:23:18.370000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 1778:1778(0) ack 1425 win 8216 <nop,nop,timestamp 18479 456388> (DF) [tos 0x8] 
18:23:18.410000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 1778:1858(80) ack 1425 win 8216 <nop,nop,timestamp 18483 456388> (DF) [tos 0x8] 
18:23:18.420000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: P 1425:1473(48) ack 1858 win 31856 <nop,nop,timestamp 456397 18483> (DF) [tos 0x8] 
18:23:18.420000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 1858:1858(0) ack 1473 win 8216 <nop,nop,timestamp 18483 456397> (DF) [tos 0x8] 
18:23:18.430000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 1858:3306(1448) ack 1473 win 8216 <nop,nop,timestamp 18484 456397> (DF) [tos 0x8] 
18:23:18.460000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 3306 win 31856 <nop,nop,timestamp 456401 18484> (DF) [tos 0x8] 
18:23:18.460000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 4754:6202(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
18:23:18.460000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 3306 win 31856 <nop,nop,timestamp 456401 18484,nop,nop, sack 1 {4754:6202} > (DF) [tos 0x8] 
18:23:18.460000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 7650:9098(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
18:23:18.460000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 3306 win 31856 <nop,nop,timestamp 456401 18484,nop,nop, sack 2 {7650:9098}{4754:6202} > (DF) [tos 0x8] 
18:23:18.460000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 3306:4754(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
18:23:18.460000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 6202 win 28960 <nop,nop,timestamp 456401 18487,nop,nop, sack 1 {7650:9098} > (DF) [tos 0x8] 
18:23:18.660000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 6202:7650(1448) ack 1473 win 8216 <nop,nop,timestamp 18508 456401> (DF) [tos 0x8] 
18:23:18.660000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 9098 win 30408 <nop,nop,timestamp 456421 18508> (DF) [tos 0x8] 
18:23:18.660000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 9098:10546(1448) ack 1473 win 8216 <nop,nop,timestamp 18508 456421> (DF) [tos 0x8] 
18:23:18.770000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 10546 win 31856 <nop,nop,timestamp 456432 18508> (DF) [tos 0x8] 
18:23:18.770000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 11994:13442(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
18:23:18.770000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 10546 win 31856 <nop,nop,timestamp 456432 18508,nop,nop, sack 1 {11994:13442} > (DF) [tos 0x8] 
18:23:18.770000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 14890:16338(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
18:23:18.770000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 10546 win 31856 <nop,nop,timestamp 456432 18508,nop,nop, sack 2 {14890:16338}{11994:13442} > (DF) [tos 0x8] 
18:23:18.770000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 10546:11994(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
18:23:18.770000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 13442 win 28960 <nop,nop,timestamp 456432 18518,nop,nop, sack 1 {14890:16338} > (DF) [tos 0x8] 
18:23:18.980000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 13442:14890(1448) ack 1473 win 8216 <nop,nop,timestamp 18540 456432> (DF) [tos 0x8] 
18:23:18.980000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 16338 win 30408 <nop,nop,timestamp 456453 18540> (DF) [tos 0x8] 
18:23:18.980000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 16338:17786(1448) ack 1473 win 8216 <nop,nop,timestamp 18540 456453> (DF) [tos 0x8] 
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540> (DF) [tos 0x8] 
18:23:19.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 19234:20682(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 1 {19234:20682} > (DF) [tos 0x8] 
18:23:19.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 22130:23578(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 2 {22130:23578}{19234:20682} > (DF) [tos 0x8] 
18:23:19.100000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 23578:25026(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
18:23:19.100000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 2 {22130:25026}{19234:20682} > (DF) [tos 0x8] 

<long pause, eventually I kill the scp process>

18:23:52.720000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: F 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:25026}{19234:20682} > (DF) [tos 0x8] 
18:23:52.720000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 25026:26474(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
18:23:52.720000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:26474}{19234:20682} > (DF) [tos 0x8] 
18:23:52.720000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 26474:27922(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
18:23:52.720000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:27922}{19234:20682} > (DF) [tos 0x8] 
18:23:52.720000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: . 27922:29370(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
18:23:52.720000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:29370}{19234:20682} > (DF) [tos 0x8] 
18:23:52.720000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: P 29370:30818(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
18:23:52.720000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:30818}{19234:20682} > (DF) [tos 0x8] 
18:23:52.720000 eth0 < 198.17.100.41.ssh > 198.17.100.42.1119: F 30818:30818(0) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
18:23:52.720000 eth0 > 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:30819}{19234:20682} > (DF) [tos 0x8] 

Full tcpdump from 198.17.100.41's point of view:

12:21:17.157458 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: S 3061649587:3061649587(0) win 32120 <mss 1460,sackOK,timestamp 456129 0,nop,wscale 0> (DF)
12:21:17.158821 eth0 > arp who-has 198.17.100.42 tell 198.17.100.41 (0:80:f6:10:50:26)
12:21:17.158925 eth0 < arp reply 198.17.100.42 is-at 0:30:65:ba:84:e6 (0:80:f6:10:50:26)
12:21:17.158954 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: S 2117491474:2117491474(0) ack 3061649588 win 5792 <mss 1460,sackOK,timestamp 18215 456129,nop,wscale 0> (DF)
12:21:17.159068 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1:1(0) ack 1 win 32120 <nop,nop,timestamp 456129 18215> (DF)
12:21:17.173245 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1:26(25) ack 1 win 5792 <nop,nop,timestamp 18217 456129> (DF)
12:21:17.173375 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1:1(0) ack 26 win 32120 <nop,nop,timestamp 456131 18217> (DF)
12:21:17.175290 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1:25(24) ack 26 win 32120 <nop,nop,timestamp 456131 18217> (DF)
12:21:17.175349 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 26:26(0) ack 25 win 5792 <nop,nop,timestamp 18217 456131> (DF)
12:21:17.176001 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 26:666(640) ack 25 win 5792 <nop,nop,timestamp 18217 456131> (DF)
12:21:17.176745 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 25:657(632) ack 666 win 31856 <nop,nop,timestamp 456131 18217> (DF)
12:21:17.210026 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 666:666(0) ack 657 win 6952 <nop,nop,timestamp 18221 456131> (DF)
12:21:17.210147 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 657:673(16) ack 666 win 31856 <nop,nop,timestamp 456134 18221> (DF)
12:21:17.210206 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 666:666(0) ack 673 win 6952 <nop,nop,timestamp 18221 456134> (DF)
12:21:17.226137 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 666:946(280) ack 673 win 6952 <nop,nop,timestamp 18222 456134> (DF)
12:21:17.241676 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 673:673(0) ack 946 win 31856 <nop,nop,timestamp 456138 18222> (DF)
12:21:17.329702 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 673:945(272) ack 946 win 31856 <nop,nop,timestamp 456146 18222> (DF)
12:21:17.360030 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 946:946(0) ack 945 win 8216 <nop,nop,timestamp 18236 456146> (DF)
12:21:17.497569 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 946:1522(576) ack 945 win 8216 <nop,nop,timestamp 18249 456146> (DF)
12:21:17.511696 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 945:945(0) ack 1522 win 31856 <nop,nop,timestamp 456165 18249> (DF)
12:21:17.511767 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1522:1538(16) ack 945 win 8216 <nop,nop,timestamp 18251 456165> (DF)
12:21:17.531683 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 945:945(0) ack 1538 win 31856 <nop,nop,timestamp 456167 18251> (DF)
12:21:17.635448 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 945:961(16) ack 1538 win 31856 <nop,nop,timestamp 456177 18251> (DF)
12:21:17.635498 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 1538:1538(0) ack 961 win 8216 <nop,nop,timestamp 18263 456177> (DF)
12:21:17.639100 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 961:1009(48) ack 1538 win 31856 <nop,nop,timestamp 456177 18263> (DF)
12:21:17.639160 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 1538:1538(0) ack 1009 win 8216 <nop,nop,timestamp 18263 456177> (DF)
12:21:17.639664 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1538:1586(48) ack 1009 win 8216 <nop,nop,timestamp 18263 456177> (DF)
12:21:17.644091 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1009:1073(64) ack 1586 win 31856 <nop,nop,timestamp 456178 18263> (DF)
12:21:17.675129 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1586:1650(64) ack 1073 win 8216 <nop,nop,timestamp 18267 456178> (DF)
12:21:17.691691 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1073:1073(0) ack 1650 win 31856 <nop,nop,timestamp 456183 18267> (DF)
12:21:19.731975 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1073:1233(160) ack 1650 win 31856 <nop,nop,timestamp 456387 18267> (DF)
12:21:19.740436 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1650:1682(32) ack 1233 win 8216 <nop,nop,timestamp 18474 456387> (DF)
12:21:19.742819 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1233:1297(64) ack 1682 win 31856 <nop,nop,timestamp 456388 18474> (DF)
12:21:19.743408 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1682:1730(48) ack 1297 win 8216 <nop,nop,timestamp 18474 456388> (DF)
12:21:19.746385 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1297:1377(80) ack 1730 win 31856 <nop,nop,timestamp 456388 18474> (DF) [tos 0x8] 
12:21:19.749056 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1730:1778(48) ack 1377 win 8216 <nop,nop,timestamp 18474 456388> (DF) [tos 0x8] 
12:21:19.751041 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1377:1425(48) ack 1778 win 31856 <nop,nop,timestamp 456388 18474> (DF) [tos 0x8] 
12:21:19.790043 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 1778:1778(0) ack 1425 win 8216 <nop,nop,timestamp 18479 456388> (DF) [tos 0x8] 
12:21:19.831486 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 1778:1858(80) ack 1425 win 8216 <nop,nop,timestamp 18483 456388> (DF) [tos 0x8] 
12:21:19.834435 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: P 1425:1473(48) ack 1858 win 31856 <nop,nop,timestamp 456397 18483> (DF) [tos 0x8] 
12:21:19.834508 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 1858:1858(0) ack 1473 win 8216 <nop,nop,timestamp 18483 456397> (DF) [tos 0x8] 
12:21:19.844416 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 1858:3306(1448) ack 1473 win 8216 <nop,nop,timestamp 18484 456397> (DF) [tos 0x8] 
12:21:19.844449 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 3306:4754(1448) ack 1473 win 8216 <nop,nop,timestamp 18484 456397> (DF) [tos 0x8] 
12:21:19.871765 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 3306 win 31856 <nop,nop,timestamp 456401 18484> (DF) [tos 0x8] 
12:21:19.871838 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 4754:6202(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
12:21:19.871858 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 6202:7650(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
12:21:19.872119 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 3306 win 31856 <nop,nop,timestamp 456401 18484,nop,nop, sack 1 {4754:6202} > (DF) [tos 0x8] 
12:21:19.872189 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 7650:9098(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
12:21:19.872456 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 3306 win 31856 <nop,nop,timestamp 456401 18484,nop,nop, sack 2 {7650:9098}{4754:6202} > (DF) [tos 0x8] 
12:21:19.872543 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 3306:4754(1448) ack 1473 win 8216 <nop,nop,timestamp 18487 456401> (DF) [tos 0x8] 
12:21:19.872810 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 6202 win 28960 <nop,nop,timestamp 456401 18487,nop,nop, sack 1 {7650:9098} > (DF) [tos 0x8] 
12:21:20.080039 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 6202:7650(1448) ack 1473 win 8216 <nop,nop,timestamp 18508 456401> (DF) [tos 0x8] 
12:21:20.080331 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 9098 win 30408 <nop,nop,timestamp 456421 18508> (DF) [tos 0x8] 
12:21:20.080400 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 9098:10546(1448) ack 1473 win 8216 <nop,nop,timestamp 18508 456421> (DF) [tos 0x8] 
12:21:20.080420 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 10546:11994(1448) ack 1473 win 8216 <nop,nop,timestamp 18508 456421> (DF) [tos 0x8] 
12:21:20.181759 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 10546 win 31856 <nop,nop,timestamp 456432 18508> (DF) [tos 0x8] 
12:21:20.181840 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 11994:13442(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
12:21:20.181860 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 13442:14890(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
12:21:20.182111 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 10546 win 31856 <nop,nop,timestamp 456432 18508,nop,nop, sack 1 {11994:13442} > (DF) [tos 0x8] 
12:21:20.182177 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 14890:16338(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
12:21:20.182436 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 10546 win 31856 <nop,nop,timestamp 456432 18508,nop,nop, sack 2 {14890:16338}{11994:13442} > (DF) [tos 0x8] 
12:21:20.182524 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 10546:11994(1448) ack 1473 win 8216 <nop,nop,timestamp 18518 456432> (DF) [tos 0x8] 
12:21:20.182796 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 13442 win 28960 <nop,nop,timestamp 456432 18518,nop,nop, sack 1 {14890:16338} > (DF) [tos 0x8] 
12:21:20.400039 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 13442:14890(1448) ack 1473 win 8216 <nop,nop,timestamp 18540 456432> (DF) [tos 0x8] 
12:21:20.400326 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 16338 win 30408 <nop,nop,timestamp 456453 18540> (DF) [tos 0x8] 
12:21:20.400394 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 16338:17786(1448) ack 1473 win 8216 <nop,nop,timestamp 18540 456453> (DF) [tos 0x8] 
12:21:20.400414 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 17786:19234(1448) ack 1473 win 8216 <nop,nop,timestamp 18540 456453> (DF) [tos 0x8] 
12:21:20.511768 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540> (DF) [tos 0x8] 
12:21:20.511847 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 19234:20682(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
12:21:20.511865 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 20682:22130(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
12:21:20.512118 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 1 {19234:20682} > (DF) [tos 0x8] 
12:21:20.512184 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 22130:23578(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
12:21:20.512442 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 2 {22130:23578}{19234:20682} > (DF) [tos 0x8] 
12:21:20.512512 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 23578:25026(1448) ack 1473 win 8216 <nop,nop,timestamp 18551 456465> (DF) [tos 0x8] 
12:21:20.512782 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 456465 18540,nop,nop, sack 2 {22130:25026}{19234:20682} > (DF) [tos 0x8] 

<long pause, eventually I kill the scp process>

12:21:54.133626 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: F 1473:1473(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:25026}{19234:20682} > (DF) [tos 0x8] 
12:21:54.133727 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 25026:26474(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
12:21:54.134047 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:26474}{19234:20682} > (DF) [tos 0x8] 
12:21:54.134130 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 26474:27922(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
12:21:54.134392 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:27922}{19234:20682} > (DF) [tos 0x8] 
12:21:54.134480 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: . 27922:29370(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
12:21:54.134738 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:29370}{19234:20682} > (DF) [tos 0x8] 
12:21:54.134814 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: P 29370:30818(1448) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
12:21:54.135102 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:30818}{19234:20682} > (DF) [tos 0x8] 
12:21:54.135956 eth0 > 198.17.100.41.ssh > 198.17.100.42.1119: F 30818:30818(0) ack 1474 win 8216 <nop,nop,timestamp 21913 459827> (DF) [tos 0x8] 
12:21:54.136058 eth0 < 198.17.100.42.1119 > 198.17.100.41.ssh: . 1474:1474(0) ack 17786 win 31856 <nop,nop,timestamp 459827 18540,nop,nop, sack 2 {22130:30819}{19234:20682} > (DF) [tos 0x8]