Message-ID: <000c01c305b5$44ccae70$7500a8c0@ice0d185> From: "Alexandre Jose Ferreira" <alexandre.j.ferreira@terra.com.br> Subject: Re: tcptrace RTT summary description Date: Fri, 18 Apr 2003 11:17:39 -0300
Hi !
You could try tcptrace -hxargs.
You 'll get something like this
$ tcptrace -houtput
OK, here's a sample output (using -l) and what each line means:
1 connection traced:
#### how many distinct TCP connections did I see pieces of
13 packets seen, 13 TCP packets traced
#### how many packets did I see, how many did I trace
connection 1:
#### I'll give you a separate block for each connection,
#### here's the first one
host a: 132.235.3.133:1084
host b: 132.235.1.2:79
#### Each connection has two hosts. To shorten output
#### and file names, I just give them letters.
#### Connection 1 has hosts 'a' and 'b', connection 2
#### has hosts 'c' and 'd', etc.
complete conn: yes
#### Did I see the starting FINs and closing SYNs? Was it
reset?
first packet: Wed Jul 20 16:40:30.688114
#### At what time did I see the first packet from this
connection?
last packet: Wed Jul 20 16:40:41.126372
#### At what time did I see the last packet from this
connection?
elapsed time: 0:00:10.438257
#### Elapsed time, first packet to last packet
total packets: 13
#### total packets this connection
#### ... Now, there's two columns of output (TCP is
#### duplex) one for each direction of packets.
#### I'll just explain one column...
a->b: b->a:
total packets: 7 total packets: 6
#### packets sent in each direction
ack pkts sent: 6 ack pkts sent: 6
#### how many of the packets contained a valid ACK
unique bytes sent: 11 unique bytes sent: 1152
#### how many data bytes were sent (not counting
retransmissions)
actual data pkts: 2 actual data pkts: 1
#### how many packets did I see that contained any amount of
data
actual data bytes: 11 actual data bytes: 1152
#### how many data bytes did I see (including retransmissions)
rexmt data pkts: 0 rexmt data pkts: 0
#### how many data packets were retransmissions
rexmt data bytes: 0 rexmt data bytes: 0
#### how many bytes were retransmissions
outoforder pkts: 0 outoforder pkts: 0
#### how many packets were out of order (or I didn't see the
first transmit!)
SYN/FIN pkts sent: 1/1 SYN/FIN pkts sent: 1/1
#### how many SYNs and FINs were sent in each direction
mss requested: 1460 bytes mss requested: 1460
bytes
#### What what the requested Maximum Segment Size
max segm size: 9 bytes max segm size: 1152
bytes
#### What was the largest segment that I saw
min segm size: 2 bytes min segm size: 1152
bytes
#### What was the smallest segment that I saw
avg segm size: 5 bytes avg segm size: 1150
bytes
#### What was the average segment that I saw
max win adv: 4096 bytes max win adv: 4096
bytes
#### What was the largest window advertisement that I sent
min win adv: 4096 bytes min win adv: 4085
bytes
#### What was the smallest window advertisement that I sent
zero win adv: 0 times zero win adv: 0
times
#### How many times did I sent a zero-sized window
advertisement
avg win adv: 4096 bytes avg win adv: 4092
bytes
#### What was the average window advertisement that I sent
initial window: 9 bytes initial window: 1152
bytes
#### How many bytes in the first window (before the first ACK)
initial window: 1 pkts initial window: 1
pkts
#### How many packets in the first window (before the first
ACK)
throughput: 1 Bps throughput: 110 Bps
#### What was the data throughput (Bytes/second)
ttl stream length: 11 bytes ttl stream length: 1152
bytes
#### What was the total length of the stream (from FIN to SYN)
#### Note that this might be larger than unique data bytes
because
#### I might not have captured every segment!!!
missed data: 0 bytes missed data: 0
bytes
#### How many bytes of data were in the stream that I didn't
see?
RTT samples: 2 RTT samples: 1
#### How many ACK's could I use to get an RTT sample
RTT min: 45.9 ms RTT min: 19.4 ms
#### What was the smallest RTT that I saw
RTT max: 199.0 ms RTT max: 19.4 ms
#### What was the largest RTT that I saw
RTT avg: 122.5 ms RTT avg: 19.4 ms
#### What was the average RTT that I saw
RTT stdev: 0.0 ms RTT stdev: 0.0 ms
#### What was the standard deviation of the RTT that I saw
segs cum acked: 0 segs cum acked: 0
#### How many segments were cumulatively ACKed (the ACK that I
saw
#### was for a later segment. Might be a lost ACK or a
delayed ACK
duplicate acks: 2 duplicate acks: 0
#### How many duplicate ACKs did I see
max # retrans: 0 max # retrans: 0
#### What was the most number of times that a single segment
#### was retransmitted
min retr time: 0.0 ms min retr time: 0.0 ms
#### What was the minimum time between retransmissions of a
#### single segment
max retr time: 0.0 ms max retr time: 0.0 ms
#### What was the maximum time between retransmissions of a
#### single segment
avg retr time: 0.0 ms avg retr time: 0.0 ms
#### What was the average time between retransmissions of a
#### single segment
sdv retr time: 0.0 ms sdv retr time: 0.0 ms
#### What was the stdev between retransmissions of a
#### single segment
Version: Ostermann's tcptrace -- version 6.3.2 -- Mon Oct 14, 2002
Compiled by Alexandre Ferreira '' at 'Thu Nov 21 14:20:53 2002' on
machine 'ICE0D185'
Goog look !
Alexandre Ferreira
----- Original Message -----
From: <tcptrace@philgra.org>
To: <tcptrace@tcptrace.org>
Sent: Thursday, April 17, 2003 6:00 PM
Subject: tcptrace RTT summary description
> Hello,
>
> Is there somewhere that describes what the -lr output means (describing
some of the fields)?
>
> Thanks,
> :-Phil
> --------------------------------------------------------------------------
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