From: Wesley Eddy (weddy@elitists.net)
Date: 09/24/03
Date: Wed, 24 Sep 2003 12:38:30 -0400 From: Wesley Eddy <weddy@elitists.net> Subject: tcptrace-bugs [owner-tcptrace@tcptrace.org: BOUNCE tcptrace@tcptrace.org: Non-member submission from [ulisses@pusa.informat.uv.es]] Message-ID: <20030924163830.GA8819@irg.cs.ohiou.edu>
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Date: Wed, 24 Sep 2003 09:08:42 +0200
From: ulisses@pusa.informat.uv.es
To: tcptrace@tcptrace.org
Subject: bug in RTT 3WHS code
Message-ID: <20030924070842.GA13442@pusa.informat.uv.es>
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Hi all,
the following trace triggers a bug in 3WHS RTT code, in this case tcptrace
doesn't calculate the SYN+ACK/ACK RTT
1063983733.559421 81.203.68.223.4354 > 147.156.10.98.80: S 3824823627:3824823627(0) win 0 <mss 1460,nop,wscale 4,nop,nop,sackOK> (DF)
1063983733.559477 147.156.10.98.80 > 81.203.68.223.4354: S 201111435:201111435(0) ack 3824823628 win 5840 <mss 1460,nop,nop,sackOK,nop,wscale 0> (DF)
1063983733.714187 81.203.68.223.4354 > 147.156.10.98.80: . ack 201111436 win 32768 (DF)
full dump is available at http://pusa/~ulisses/81.203.68.223:4354.dump
I'm trying to find the bug...
Ulisses
the output of tcptrace
1 arg remaining, starting with '/home/ulisses/dumps/81.203.68.223:4354.dump'
Ostermann's tcptrace -- version 6.4.2 -- Sat May 3, 2003
84 packets seen, 84 TCP packets traced
elapsed wallclock time: 0:00:00.001791, 46901 pkts/sec analyzed
trace file elapsed time: 0:00:33.754474
TCP connection info:
1 TCP connection traced:
TCP connection 1:
host a: 81.203.68.223:4354
host b: 147.156.10.98:80
complete conn: yes
first packet: Fri Sep 19 15:02:13.559421 2003
last packet: Fri Sep 19 15:02:47.313896 2003
elapsed time: 0:00:33.754474
total packets: 84
filename: /home/ulisses/dumps/81.203.68.223:4354.dump
a->b: b->a:
total packets: 37 total packets: 47
ack pkts sent: 36 ack pkts sent: 47
pure acks sent: 21 pure acks sent: 1
sack pkts sent: 5 sack pkts sent: 0
max sack blks/ack: 1 max sack blks/ack: 0
unique bytes sent: 6339 unique bytes sent: 52319
actual data pkts: 14 actual data pkts: 44
actual data bytes: 6339 actual data bytes: 53779
rexmt data pkts: 0 rexmt data pkts: 1
rexmt data bytes: 0 rexmt data bytes: 1460
zwnd probe pkts: 0 zwnd probe pkts: 1
zwnd probe bytes: 0 zwnd probe bytes: 0
outoforder pkts: 0 outoforder pkts: 0
pushed data pkts: 14 pushed data pkts: 16
SYN/FIN pkts sent: 1/1 SYN/FIN pkts sent: 1/1
req 1323 ws/ts: Y/N req 1323 ws/ts: Y/N
adv wind scale: 4 adv wind scale: 0
req sack: Y req sack: Y
sacks sent: 5 sacks sent: 0
urgent data pkts: 0 pkts urgent data pkts: 0 pkts
urgent data bytes: 0 bytes urgent data bytes: 0 bytes
mss requested: 1460 bytes mss requested: 1460 bytes
max segm size: 555 bytes max segm size: 1460 bytes
min segm size: 435 bytes min segm size: 68 bytes
avg segm size: 452 bytes avg segm size: 1222 bytes
max win adv: 524288 bytes max win adv: 20535 bytes
min win adv: 522880 bytes min win adv: 5840 bytes
zero win adv: 0 times zero win adv: 0 times
avg win adv: 509858 bytes avg win adv: 12601 bytes
initial window: 503 bytes initial window: 2920 bytes
initial window: 1 pkts initial window: 2 pkts
ttl stream length: 6339 bytes ttl stream length: 52319 bytes
missed data: 0 bytes missed data: 0 bytes
truncated data: 5751 bytes truncated data: 51931 bytes
truncated packets: 14 pkts truncated packets: 44 pkts
data xmit time: 15.782 secs data xmit time: 17.395 secs
idletime max: 15823.2 ms idletime max: 16074.1 ms
throughput: 188 Bps throughput: 1550 Bps
RTT samples: 16 RTT samples: 26
RTT min: 0.0 ms RTT min: 27.6 ms
RTT max: 1.4 ms RTT max: 839.1 ms
RTT avg: 0.4 ms RTT avg: 452.4 ms
RTT stdev: 0.3 ms RTT stdev: 257.9 ms
RTT from 3WHS: 0.1 ms RTT from 3WHS: 0.0 ms
RTT full_sz smpls: 1 RTT full_sz smpls: 11
RTT full_sz min: 1.4 ms RTT full_sz min: 235.5 ms
RTT full_sz max: 1.4 ms RTT full_sz max: 839.1 ms
RTT full_sz avg: 1.4 ms RTT full_sz avg: 533.5 ms
RTT full_sz stdev: 0.0 ms RTT full_sz stdev: 190.0 ms
post-loss acks: 0 post-loss acks: 1
segs cum acked: 0 segs cum acked: 17
duplicate acks: 0 duplicate acks: 5
triple dupacks: 0 triple dupacks: 1
max # retrans: 0 max # retrans: 1
min retr time: 0.0 ms min retr time: 870.9 ms
max retr time: 0.0 ms max retr time: 870.9 ms
avg retr time: 0.0 ms avg retr time: 870.9 ms
sdv retr time: 0.0 ms sdv retr time: 0.0 ms
Debian GNU/Linux: a dream come true
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