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SubjectVery poor TCP/SACK performance
  I noticed two different problems while a friend was receiving a file
from my system. The first one might not be a real problem, I don't know
exactly how SACK resends are handled. The second problem looks like a
definite bug in TCP somewhere.

General info about the transfer:
207.75.231.233 (2.1.118) receiving a 4.5meg file over FTP from
207.75.226.50 (2.1.120). Both systems are dialups, 207.75.231.233 has a
poor quality connection. Info is from 207.75.226.50's side. I'll refer
to them by the last 16 bits now. No other significant transfers were
taking place at the time of the problems.

First situation:
Transfer was going ok, but suddenly 231.233 missed a bunch of packets, so
226.50 resent some of them slowly. 231.233 acked them, so 226.50 sent out
a ton of packets. 231.233 missed some of them, but acked a lot of them,
and continued to update its sack info. 226.50 however just sat there for
about 30 seconds until it resent, and then things continued normally
(until the second situation). If the other system is responding to the
out-of-order packets and updating its sack info, is there a reason why it
should delay the resend? I'm not sure exactly how sack handles the info,
so maybe it must wait, it just seems like from what I understand of the
protocol it wouldn't have to and it should be doing the corrections
on-the-fly?

-----
23:32:32.691103 207.75.226.50.20 > 207.75.231.233.1075: P 71265:71789(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.691103 207.75.226.50.20 > 207.75.231.233.1075: . 71789:72313(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.691103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730030 3925986,nop,nop,sack 30164@16889 34356@16889> (DF) [tos 0x8]
23:32:32.691103 207.75.226.50.20 > 207.75.231.233.1075: P 72313:72837(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.691103 207.75.226.50.20 > 207.75.231.233.1075: P 72837:73361(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: . 73361:73885(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: P 73885:74409(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: . 74409:74933(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: P 74933:75457(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: . 75457:75981(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: P 75981:76505(524) ack 0 win 32488 <nop,nop,timestamp 3926083 730030> (DF) [tos 0x8]
23:32:32.941103 207.75.226.50.20 > 207.75.231.233.1075: P 64977:65501(524) ack 0 win 32488 <nop,nop,timestamp 3926084 730030> (DF) [tos 0x8]
23:32:33.661103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730126 3926083,nop,nop,sack 34356@16889 34880@16889> (DF) [tos 0x8]
23:32:33.871103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730148 3926083,nop,nop,sack 34356@16889 35404@16889> (DF) [tos 0x8]
23:32:34.081103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730169 3926083,nop,nop,sack 34356@16889 35928@16889> (DF) [tos 0x8]
23:32:34.301103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730191 3926083,nop,nop,sack 34356@16889 36452@16889> (DF) [tos 0x8]
23:32:34.831103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730244 3926083,nop,nop,sack 34356@16889 36976@16889> (DF) [tos 0x8]
23:32:35.021103 207.75.231.233.1075 > 207.75.226.50.20: . ack 64977 win 32488 <nop,nop,timestamp 730265 3926083,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:08.261103 207.75.226.50.20 > 207.75.231.233.1075: P 64977:65501(524) ack 0 win 32488 <nop,nop,timestamp 3929640 730265> (DF) [tos 0x8]
23:33:09.231103 207.75.231.233.1075 > 207.75.226.50.20: . ack 65501 win 31964 <nop,nop,timestamp 733685 3929640,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:09.231103 207.75.226.50.20 > 207.75.231.233.1075: . 65501:66025(524) ack 0 win 32488 <nop,nop,timestamp 3929737 733685> (DF) [tos 0x8]
23:33:10.181103 207.75.231.233.1075 > 207.75.226.50.20: . ack 66025 win 31440 <nop,nop,timestamp 733781 3929737,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:10.181103 207.75.226.50.20 > 207.75.231.233.1075: P 66025:66549(524) ack 0 win 32488 <nop,nop,timestamp 3929832 733781> (DF) [tos 0x8]
23:33:11.121103 207.75.231.233.1075 > 207.75.226.50.20: . ack 66549 win 30916 <nop,nop,timestamp 733875 3929832,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:11.121103 207.75.226.50.20 > 207.75.231.233.1075: . 66549:67073(524) ack 0 win 32488 <nop,nop,timestamp 3929926 733875> (DF) [tos 0x8]
23:33:12.091103 207.75.231.233.1075 > 207.75.226.50.20: . ack 67073 win 30392 <nop,nop,timestamp 733972 3929926,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:12.091103 207.75.226.50.20 > 207.75.231.233.1075: P 67073:67597(524) ack 0 win 32488 <nop,nop,timestamp 3930023 733972> (DF) [tos 0x8]
23:33:13.241103 207.75.231.233.1075 > 207.75.226.50.20: . ack 67597 win 29868 <nop,nop,timestamp 734087 3930023,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:13.241103 207.75.226.50.20 > 207.75.231.233.1075: . 67597:68121(524) ack 0 win 32488 <nop,nop,timestamp 3930138 734087> (DF) [tos 0x8]
23:33:14.191103 207.75.231.233.1075 > 207.75.226.50.20: . ack 68121 win 29344 <nop,nop,timestamp 734182 3930138,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:14.191103 207.75.226.50.20 > 207.75.231.233.1075: P 68121:68645(524) ack 0 win 32488 <nop,nop,timestamp 3930233 734182> (DF) [tos 0x8]
23:33:21.811103 207.75.231.233.1075 > 207.75.226.50.20: . ack 68645 win 28820 <nop,nop,timestamp 734277 3930233,nop,nop,sack 34356@16889 37500@16889> (DF) [tos 0x8]
23:33:21.811103 207.75.226.50.20 > 207.75.231.233.1075: . 68645:69169(524) ack 0 win 32488 <nop,nop,timestamp 3930995 734277> (DF) [tos 0x8]
23:33:22.801103 207.75.231.233.1075 > 207.75.226.50.20: . ack 72313 win 26724 <nop,nop,timestamp 735044 3930995> (DF) [tos 0x8]
23:33:22.801103 207.75.226.50.20 > 207.75.231.233.1075: P 72313:72837(524) ack 0 win 32488 <nop,nop,timestamp 3931094 735044> (DF) [tos 0x8]
23:33:24.231103 207.75.231.233.1075 > 207.75.226.50.20: . ack 72837 win 32488 <nop,nop,timestamp 735188 3931094> (DF) [tos 0x8]
23:33:24.231103 207.75.226.50.20 > 207.75.231.233.1075: P 72837:73361(524) ack 0 win 32488 <nop,nop,timestamp 3931237 735188> (DF) [tos 0x8]
23:33:25.671103 207.75.231.233.1075 > 207.75.226.50.20: . ack 73361 win 32488 <nop,nop,timestamp 735331 3931237> (DF) [tos 0x8]
23:33:25.671103 207.75.226.50.20 > 207.75.231.233.1075: . 73361:73885(524) ack 0 win 32488 <nop,nop,timestamp 3931381 735331> (DF) [tos 0x8]
23:33:27.101103 207.75.231.233.1075 > 207.75.226.50.20: . ack 73885 win 32488 <nop,nop,timestamp 735475 3931381> (DF) [tos 0x8]
23:33:27.101103 207.75.226.50.20 > 207.75.231.233.1075: P 73885:74409(524) ack 0 win 32488 <nop,nop,timestamp 3931524 735475> (DF) [tos 0x8]
-----

Second situation:
Transfer was again going ok, but suddenly it dropped off to only one
packet every 2 minutes for almost half an hour! All the packets sent were
being acked, with the main ack counter updating. That can't be right.
The 2min/packet behavior continued until around 00:05. By then it was
transferring normally again, but I wasn't watching at the time so I didn't
catch what brought it back to life. The behavior is repeating AGAIN as
I'm writing this message, hopefully it doesn't take another half-hour to
continue (it's a semi-unattended transfer). Ok it's going again, but it
didn't take a half-hour this time. I missed the point where it returns to
normal again though. Now its doing it again... it seems the transfer
slows just after the sack info drops from 3 args to 2? Ok caught it
returning to normal this time.

-----
23:35:50.681103 207.75.226.50.20 > 207.75.231.233.1075: . 239469:239993(524) ack 0 win 32488 <nop,nop,timestamp 3945882 749831> (DF) [tos 0x8]
23:35:51.271103 207.75.231.233.1075 > 207.75.226.50.20: . ack 209601 win 30392 <nop,nop,timestamp 749887 3945598,nop,nop,sack 58388@16891 2808@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:51.521103 207.75.231.233.1075 > 207.75.226.50.20: . ack 209601 win 30392 <nop,nop,timestamp 749915 3945623,nop,nop,sack 58388@16891 3332@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:51.791103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 749941 3945649,nop,nop,sack 58388@16891 3332@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:51.791103 207.75.226.50.20 > 207.75.231.233.1075: P 210125:210649(524) ack 0 win 32488 <nop,nop,timestamp 3945993 749941> (DF) [tos 0x8]
23:35:52.011103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 749962 3945649,nop,nop,sack 58388@16891 3856@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:52.251103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 749984 3945649,nop,nop,sack 58388@16891 4380@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:52.491103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750011 3945675,nop,nop,sack 58388@16891 4904@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:52.761103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750037 3945728,nop,nop,sack 58388@16891 5428@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:53.011103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750063 3945751,nop,nop,sack 58388@16891 5952@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:53.271103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750089 3945778,nop,nop,sack 58388@16891 6476@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:53.521103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750114 3945805,nop,nop,sack 58388@16891 7000@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:53.781103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750140 3945833,nop,nop,sack 58388@16891 7524@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:54.041103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750166 3945857,nop,nop,sack 58388@16891 8048@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:54.311103 207.75.231.233.1075 > 207.75.226.50.20: . ack 210125 win 29868 <nop,nop,timestamp 750194 3945882,nop,nop,sack 58388@16891 8572@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:54.571103 207.75.231.233.1075 > 207.75.226.50.20: . ack 212745 win 27248 <nop,nop,timestamp 750219 3945993,nop,nop,sack 58388@16891 8572@16892 47384@16891[|tcp]> (DF) [tos 0x8]
23:35:54.571103 207.75.226.50.20 > 207.75.231.233.1075: . 212745:213269(524) ack 0 win 32488 <nop,nop,timestamp 3946271 750219> (DF) [tos 0x8]
23:36:00.641103 207.75.231.233.1075 > 207.75.226.50.20: . ack 223749 win 16244 <nop,nop,timestamp 750317 3946271,nop,nop,sack 58388@16891 8572@16892> (DF) [tos 0x8]
23:36:00.641103 207.75.226.50.20 > 207.75.231.233.1075: P 223749:224273(524) ack 0 win 32488 <nop,nop,timestamp 3946878 750317> (DF) [tos 0x8]
23:36:03.361103 207.75.231.233.1075 > 207.75.226.50.20: . ack 231609 win 19912 <nop,nop,timestamp 751100 3946878,nop,nop,sack 188@16892 8572@16892> (DF) [tos 0x8]
23:36:12.811103 207.75.226.50.20 > 207.75.231.233.1075: P 231609:232133(524) ack 0 win 32488 <nop,nop,timestamp 3948095 751100> (DF) [tos 0x8]
23:36:13.791103 207.75.231.233.1075 > 207.75.226.50.20: . ack 232133 win 31440 <nop,nop,timestamp 752143 3948095,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:36:13.791103 207.75.226.50.20 > 207.75.231.233.1075: . 232133:232657(524) ack 0 win 32488 <nop,nop,timestamp 3948193 752143> (DF) [tos 0x8]
23:36:14.751103 207.75.231.233.1075 > 207.75.226.50.20: . ack 232657 win 31440 <nop,nop,timestamp 752239 3948193,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:37:54.111103 207.75.226.50.20 > 207.75.231.233.1075: P 232657:233181(524) ack 0 win 32488 <nop,nop,timestamp 3958225 752239> (DF) [tos 0x8]
23:37:55.081103 207.75.231.233.1075 > 207.75.226.50.20: . ack 233181 win 31440 <nop,nop,timestamp 762273 3958225,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:39:55.081103 207.75.226.50.20 > 207.75.231.233.1075: . 233181:233705(524) ack 0 win 32488 <nop,nop,timestamp 3970322 762273> (DF) [tos 0x8]
23:39:57.261103 207.75.231.233.1075 > 207.75.226.50.20: . ack 233705 win 31440 <nop,nop,timestamp 774370 3970322,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:41:57.261103 207.75.226.50.20 > 207.75.231.233.1075: P 233705:234229(524) ack 0 win 32488 <nop,nop,timestamp 3982540 774370> (DF) [tos 0x8]
23:42:00.541103 207.75.231.233.1075 > 207.75.226.50.20: . ack 234229 win 31440 <nop,nop,timestamp 786588 3982540,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:44:00.541103 207.75.226.50.20 > 207.75.231.233.1075: . 234229:234753(524) ack 0 win 32488 <nop,nop,timestamp 3994868 786588> (DF) [tos 0x8]
23:44:02.811103 207.75.231.233.1075 > 207.75.226.50.20: . ack 234753 win 31440 <nop,nop,timestamp 799050 3994868,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:46:02.811103 207.75.226.50.20 > 207.75.231.233.1075: P 234753:235277(524) ack 0 win 32488 <nop,nop,timestamp 4007095 799050> (DF) [tos 0x8]
23:46:03.871103 207.75.231.233.1075 > 207.75.226.50.20: . ack 235277 win 31440 <nop,nop,timestamp 811156 4007095,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:48:03.871103 207.75.226.50.20 > 207.75.231.233.1075: . 235277:235801(524) ack 0 win 32488 <nop,nop,timestamp 4019201 811156> (DF) [tos 0x8]
23:48:04.931103 207.75.231.233.1075 > 207.75.226.50.20: . ack 235801 win 31440 <nop,nop,timestamp 823262 4019201,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
23:50:04.931103 207.75.226.50.20 > 207.75.231.233.1075: P 235801:236325(524) ack 0 win 32488 <nop,nop,timestamp 4031307 823262> (DF) [tos 0x8]
23:50:05.881103 207.75.231.233.1075 > 207.75.226.50.20: . ack 236325 win 31440 <nop,nop,timestamp 835359 4031307,nop,nop,sack 712@16892 8572@16892> (DF) [tos 0x8]
-----

Here is the next occurance:
-----
00:16:06.451103 207.75.226.50.20 > 207.75.231.233.1075: P 974117:974641(524) ack 0 win 32488 <nop,nop,timestamp 4187459 991426> (DF) [tos 0x8]
00:16:06.651103 207.75.231.233.1075 > 207.75.226.50.20: . ack 974117 win 26200 <nop,nop,timestamp 991448 4187104,nop,nop,sack 22324@16903 45904@16903> (DF) [tos 0x8]
00:16:06.911103 207.75.231.233.1075 > 207.75.226.50.20: . ack 974117 win 26200 <nop,nop,timestamp 991474 4187151,nop,nop,sack 22324@16903 46428@16903> (DF) [tos 0x8]
00:16:07.171103 207.75.231.233.1075 > 207.75.226.50.20: . ack 974117 win 26200 <nop,nop,timestamp 991499 4187171,nop,nop,sack 22324@16903 46952@16903> (DF) [tos 0x8]
00:16:17.301103 207.75.226.50.20 > 207.75.231.233.1075: P 974117:974641(524) ack 0 win 32488 <nop,nop,timestamp 4188544 991499> (DF) [tos 0x8]
00:16:18.301103 207.75.231.233.1075 > 207.75.226.50.20: . ack 974117 win 26200 <nop,nop,timestamp 991524 4187198,nop,nop,sack 22324@16903 47476@16903> (DF) [tos 0x8]
00:16:18.331103 207.75.231.233.1075 > 207.75.226.50.20: . ack 974117 win 26200 <nop,nop,timestamp 991548 4187223,nop,nop,sack 22324@16903 48000@16903> (DF) [tos 0x8]
00:16:18.361103 207.75.231.233.1075 > 207.75.226.50.20: . ack 994553 win 5764 <nop,nop,timestamp 991574 4187459,nop,nop,sack 42236@16903 48000@16903> (DF) [tos 0x8]
00:16:18.361103 207.75.226.50.20 > 207.75.231.233.1075: P 994553:995077(524) ack 0 win 32488 <nop,nop,timestamp 4188650 991574> (DF) [tos 0x8]
00:16:18.361103 207.75.231.233.1075 > 207.75.226.50.20: . ack 994553 win 32488 <nop,nop,timestamp 991574 4187459,nop,nop,sack 42236@16903 48000@16903> (DF) [tos 0x8]
00:16:18.401103 207.75.231.233.1075 > 207.75.226.50.20: . ack 994553 win 32488 <nop,nop,timestamp 992600 4188544,nop,nop,sack 42236@16903 48000@16903> (DF) [tos 0x8]
00:16:19.321103 207.75.231.233.1075 > 207.75.226.50.20: . ack 995077 win 31964 <nop,nop,timestamp 992715 4188650,nop,nop,sack 42760@16903 48000@16903> (DF) [tos 0x8]
00:17:34.861103 207.75.226.50.20 > 207.75.231.233.1075: . 995077:995601(524) ack 0 win 32488 <nop,nop,timestamp 4196300 992715> (DF) [tos 0x8]
00:17:36.401103 207.75.231.233.1075 > 207.75.226.50.20: . ack 995601 win 31440 <nop,nop,timestamp 1000424 4196300,nop,nop,sack 42760@16903 48000@16903> (DF) [tos 0x8]
00:19:36.401103 207.75.226.50.20 > 207.75.231.233.1075: P 995601:996125(524) ack 0 win 32488 <nop,nop,timestamp 4208454 1000424> (DF) [tos 0x8]
00:19:37.441103 207.75.231.233.1075 > 207.75.226.50.20: . ack 996125 win 31440 <nop,nop,timestamp 1012529 4208454,nop,nop,sack 42760@16903 48000@16903> (DF) [tos 0x8]
00:21:37.441103 207.75.226.50.20 > 207.75.231.233.1075: . 996125:996649(524) ack 0 win 32488 <nop,nop,timestamp 4220558 1012529> (DF) [tos 0x8]
00:21:38.361103 207.75.231.233.1075 > 207.75.226.50.20: . ack 996649 win 31440 <nop,nop,timestamp 1024622 4220558,nop,nop,sack 42760@16903 48000@16903> (DF) [tos 0x8]
00:23:38.361103 207.75.226.50.20 > 207.75.231.233.1075: P 996649:997173(524) ack 0 win 32488 <nop,nop,timestamp 4232650 1024622> (DF) [tos 0x8]
00:23:39.331103 207.75.231.233.1075 > 207.75.226.50.20: . ack 997173 win 31440 <nop,nop,timestamp 1036721 4232650,nop,nop,sack 42760@16903 48000@16903> (DF) [tos 0x8]
00:25:39.331103 207.75.226.50.20 > 207.75.231.233.1075: . 997173:997697(524) ack 0 win 32488 <nop,nop,timestamp 4244747 1036721> (DF) [tos 0x8]
00:25:40.271103 207.75.231.233.1075 > 207.75.226.50.20: . ack 997697 win 31440 <nop,nop,timestamp 1048815 4244747,nop,nop,sack 42760@16903 48000@16903> (DF) [tos 0x8]
-----

And another:
-----
01:07:37.321103 207.75.226.50.20 > 207.75.231.233.1075: . 2491097:2491621(524) ack 0 win 32488 <nop,nop,timestamp 4496546 1300540> (DF) [tos 0x8]
01:07:38.291103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2491621 win 25676 <nop,nop,timestamp 1300636 4496546,nop,nop,sack 51364@16926 57652@16926 33024@16926[|tcp]> (DF) [tos 0x8]
01:07:38.291103 207.75.226.50.20 > 207.75.231.233.1075: P 2491621:2492145(524) ack 0 win 32488 <nop,nop,timestamp 4496643 1300636> (DF) [tos 0x8]
01:07:39.251103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2492145 win 25152 <nop,nop,timestamp 1300732 4496643,nop,nop,sack 51364@16926 57652@16926 33024@16926[|tcp]> (DF) [tos 0x8]
01:07:39.251103 207.75.226.50.20 > 207.75.231.233.1075: . 2492145:2492669(524) ack 0 win 32488 <nop,nop,timestamp 4496739 1300732> (DF) [tos 0x8]
01:07:44.711103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2509961 win 7336 <nop,nop,timestamp 1300859 4496739,nop,nop,sack 51364@16926 57652@16926> (DF) [tos 0x8]
01:07:44.711103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2509961 win 28296 <nop,nop,timestamp 1300859 4496739,nop,nop,sack 51364@16926 57652@16926> (DF) [tos 0x8]
01:07:45.471103 207.75.226.50.20 > 207.75.231.233.1075: P 2509961:2510485(524) ack 0 win 32488 <nop,nop,timestamp 4497361 1300859> (DF) [tos 0x8]
01:07:46.621103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2510485 win 27772 <nop,nop,timestamp 1301454 4497361,nop,nop,sack 51364@16926 57652@16926> (DF) [tos 0x8]
01:07:46.621103 207.75.226.50.20 > 207.75.231.233.1075: . 2510485:2511009(524) ack 0 win 32488 <nop,nop,timestamp 4497476 1301454> (DF) [tos 0x8]
01:07:47.681103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2513629 win 27772 <nop,nop,timestamp 1301576 4497476,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
01:07:47.681103 207.75.226.50.20 > 207.75.231.233.1075: . 2513629:2514153(524) ack 0 win 32488 <nop,nop,timestamp 4497582 1301576> (DF) [tos 0x8]
01:07:48.631103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2514153 win 31440 <nop,nop,timestamp 1301671 4497582,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
01:08:25.211103 207.75.226.50.20 > 207.75.231.233.1075: P 2514153:2514677(524) ack 0 win 32488 <nop,nop,timestamp 4501335 1301671> (DF) [tos 0x8]
01:08:26.381103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2514677 win 31440 <nop,nop,timestamp 1305447 4501335,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
01:09:32.621103 207.75.226.50.20 > 207.75.231.233.1075: . 2514677:2515201(524) ack 0 win 32488 <nop,nop,timestamp 4508076 1305447> (DF) [tos 0x8]
01:09:33.581103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2515201 win 31440 <nop,nop,timestamp 1312167 4508076,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
01:11:33.581103 207.75.226.50.20 > 207.75.231.233.1075: P 2515201:2515725(524) ack 0 win 32488 <nop,nop,timestamp 4520172 1312167> (DF) [tos 0x8]
01:11:34.561103 207.75.231.233.1075 > 207.75.226.50.20: . ack 2515725 win 31440 <nop,nop,timestamp 1324266 4520172,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
-----

Start of a return-to-normal (tcpdump restarted):
-----
01:17:38.231103 207.75.226.50.20 > 207.75.231.233.1075: . 1109319464:1109319988(524) ack 941739234 win 32488 <nop,nop,timestamp 4556637 1348635> (DF) [tos 0x8]
01:17:39.581103 207.75.231.233.1075 > 207.75.226.50.20: . ack 524 win 31440 <nop,nop,timestamp 1360771 4556637,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
01:17:39.581103 207.75.226.50.20 > 207.75.231.233.1075: P 524:1048(524) ack 1 win 32488 <nop,nop,timestamp 4556772 1360771> (DF) [tos 0x8]
01:17:40.631103 207.75.231.233.1075 > 207.75.226.50.20: . ack 1048 win 31440 <nop,nop,timestamp 1360876 4556772,nop,nop,sack 53984@16926 57652@16926> (DF) [tos 0x8]
-----

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Jeff DeFouw <mrj@i2k.com>
I2K Staff - http://www.i2k.com


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