Linux TCP problem while talking to hostme.bkbits.net ?

From: Meelis Roos (mroos@linux.ee)
Date: Sun Aug 11 2002 - 07:19:17 EST

Linux 2.4.19 (+i2c/lm_sensors), x86 (Duron 600). I'm trying to do
'bk pull' for linux-2.4 tree from linux.bkbits.net. This has worked
before (even with the same kernel) but has failed for several days now.
The symptoms are that my linux sends 2 packets of data, hostme ack's
them, hostme sends 2 packets of data (seen from linux tcpdump output),
my linux acks only the secound with sack. Now every now and then hostme
tries to push its first packet through but linux ignores it. Broken
checksum or smth worse?

tcpdump -s 1500 -w pkts.bk from my linux box is attached, here it is in
text form:

15:04:00.102445 pc170.trtcab10a.comtrade.ee.35279 > hostme.bkbits.net.www: S 3220370823:3220370823(0) win 5840 <mss 1460,sackOK,timestamp 26461830 0,nop,wscale 0> (DF)
15:04:00.517063 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: S 3214011989:3214011989(0) ack 3220370824 win 5792 <mss 1460,sackOK,timestamp 454537726 26461830,nop,wscale 0> (DF)
15:04:00.517162 pc170.trtcab10a.comtrade.ee.35279 > hostme.bkbits.net.www: . ack 1 win 5840 <nop,nop,timestamp 26461872 454537726> (DF)
15:04:00.518138 pc170.trtcab10a.comtrade.ee.35279 > hostme.bkbits.net.www: P 1:184(183) ack 1 win 5840 <nop,nop,timestamp 26461872 454537726> (DF)
15:04:00.945486 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: . ack 184 win 6432 <nop,nop,timestamp 454537769 26461872> (DF)
15:04:00.945589 pc170.trtcab10a.comtrade.ee.35279 > hostme.bkbits.net.www: P 184:500(316) ack 1 win 5840 <nop,nop,timestamp 26461915 454537769> (DF)
15:04:01.349910 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: . ack 500 win 7504 <nop,nop,timestamp 454537810 26461915> (DF)
15:04:01.350952 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454537810 26461915> (DF)
15:04:01.353252 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 205:219(14) ack 500 win 7504 <nop,nop,timestamp 454537810 26461915> (DF)
15:04:01.353296 pc170.trtcab10a.comtrade.ee.35279 > hostme.bkbits.net.www: . ack 1 win 5840 <nop,nop,timestamp 26461955 454537810,nop,nop,sack sack 1 {205:219} > (DF)
15:04:01.412649 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: FP 219:1386(1167) ack 500 win 7504 <nop,nop,timestamp 454537816 26461915> (DF)
15:04:03.467400 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454538025 26461955> (DF)
15:04:07.796399 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454538455 26461955> (DF)
15:04:16.390267 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454539315 26461955> (DF)
15:04:33.597306 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454541035 26461955> (DF)
15:05:07.978241 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454544475 26461955> (DF)
15:06:16.805594 hostme.bkbits.net.www > pc170.trtcab10a.comtrade.ee.35279: P 1:205(204) ack 500 win 7504 <nop,nop,timestamp 454551355 26461955> (DF)

And so on. 

-- 
Meelis Roos (mroos@linux.ee)
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