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NAME ^

sample-summary.pod - An annotated version of t/sample_output/sample.csv

SYNOPSIS ^

This is an annotated version of t/sample_output/sample.csv, the sample summary file generated by Net::Traces::TSH after processing t/sample_input/sample.tsh (see also t/process_trace.t).

DESCRIPTION ^

The following sections explain the contents of the comma separated values (CSV) file t/sample_output/sample.csv.

General Trace Information

This section contains the trace filename, date, duration (in seconds), and the number of records it contains. The date is calculated from the timestamp, usually part of the filename. Since the trace filename (sample.tsh) does not contain a timestamp, "Unknown" is displayed.

 Filename,t/sample_input/sample.tsh,Unknown
 Duration,0.937457
 Records,1000
 Interfaces,2

If the trace filename was AIX-1072917725-1.csv, instead of sample.tsh, then first line would have been

 Filename,AIX-1072917725-1.csv,Thu Jan 1 00:42:05 2004 GMT

Interface Information and Traffic Density

These two sections are present only in per-interface summary files (see t/sample_output/sample.if-1.csv and t/sample_output/sample.if-2.csv. The first section,

 INTERFACE INFORMATION
 Interface Number,1
 Duration,0.937457
 Records,673

provides information similar to the general trace described above.

The second section, below, presents the number of packets per second, bytes per packet, and bits per second for IP and TCP for this particular interface:

 INTERFACE TRAFFIC DENSITY
 ,Pkts/s,Bytes/Pkt,b/s
 IP Total,718,230,1323231
 TCP Total,596,234,1117338

Traffic Statistics

The next two sections present the tally of packets and bytes, respectively, for IP and each transport present in the trace. We keep counts of the total packets/bytes, the number of packets/bytes with the DF (don't fragment) bit set, the MF (more fragments) bit set, the packets/bytes from ECN-aware connections (ECT and CE), and traffic requesting differentiated services (DiffServ - Normal, Class Selector, Assured Forwarding, Expedited Forwarding). We also count the number of packets/bytes that carry IP options.

 IP STATISTICS (PACKETS)
 ,,Fragmentation,,Explicit Congestion Notification,,Differentiated Services,,,,IP Options
 ,Total ,DF ,MF ,ECT ,CE ,Normal ,Class Selector ,AF PHB ,EF PHB ,No IP Options ,IP Options 
 IP,1000,895,0,0,0,1000,0,0,0,1000,0
 ICMP,22,6,0,0,0,22,0,0,0,22,0
 TCP,842,829,0,0,0,842,0,0,0,842,0
 UDP,133,60,0,0,0,133,0,0,0,133,0
 Unknown,3,0,0,0,0,3,0,0,0,3,0

It can be seen that the transport protocols present in this small trace are ICMP, TCP, UDP, and some other "unknown". No packets belong to ECN-aware traffic. All packets ask for "normal" delivery (best effort, no DiffServ) and no packets carry IP options.

 IP STATISTICS (BYTES)
 ,,Fragmentation,,Explicit Congestion Notification,,Differentiated Services,,,,IP Options
 ,Total ,DF ,MF ,ECT ,CE ,Normal ,Class Selector ,AF PHB ,EF PHB ,No IP Options ,IP Options 
 IP,356422,340088,0,0,0,356422,0,0,0,356422,0
 ICMP,1700,336,0,0,0,1700,0,0,0,1700,0
 TCP,326308,325656,0,0,0,326308,0,0,0,326308,0
 UDP,28198,14096,0,0,0,28198,0,0,0,28198,0
 Unknown,216,0,0,0,0,216,0,0,0,216,0

TCP Acknowledgements

This section presents how TCP receivers acknowledge segments.

 Total ACKs,576
 Cumulative ACKs,506
 Pure ACKs,151
 Options ACKs,70

Note that

 Total ACKs = Cumulative ACKs + Options ACKs

and

 Pure ACKs <= Cumulative ACKs

"Pure ACKs" are just this: 40-byte TCP segments with the ACK bit set and no options or payload. "Options ACKs" are acknowledgements that carry some TCP options, such as SACK blocks or timestamps, and may carry a payload.

(TCP) Receiver Advertised Window

This section presents counts of the receiver advertised window recorded in the TCP header of a SYN or a SYN/ACK segment. The "hard count" includes only 40-byte SYN(/ACK)s. The "soft count" includes all SYN and SYN/ACK segments regardless of size. The issue with the "soft count" is that it may include SYN(/ACK)s that feature a window scale factor. That is, the value read in the receiver advertised window field of the TCP header may be the much less than the actually advertised window.

 Size (Bytes),Soft Count,Hard Count
 5840,4,0
 8192,2,0
 8760,42,0
 10767,1,0
 16384,85,0
 17019,1,0
 24616,3,0
 24820,5,0
 25200,2,0
 32000,1,0
 34932,1,0
 44620,1,0
 46080,1,0
 46424,0,1
 49640,1,0
 60015,1,0
 60352,2,0
 64170,1,0
 64240,42,0
 64512,24,0
 64800,1,0
 65280,5,0
 65535,46,0

For example, 46 SYN(/ACK)s carry a receiver advertised window of 65535 bytes. All 46 of them carry some TCP options, because the "hard count" is empty, that is, 0. We have only one case where we actually find a "hard count" value: a peer advertising a receiver window of 46424 bytes.

TCP Options Negotiation

This section presents counts of the SYN and SYN/ACK segments and their respective TCP header length. We can use this information to quantify TCP options deployment. A TCP header length of 20 bytes means that the SYN(/ACK) carried no options.

 TCP Header Length (Bytes),SYN,SYN/ACK
 20,0,1
 24,2,0
 28,252,1
 32,2,4
 40,3,0
 44,5,3
 SYN/Payload,0

The last line (SYN/Payload) shows how many SYN(/ACK)s carry a payload (in this case, none).

TCP Options ACK Usage

This section details the "Options ACKs" above, presenting the TCP header length of the ACKs carrying some TCP option(s).

 TCP Header Length (Bytes),Count
 28,1
 32,63
 40,1
 44,5

Packet Size Distribution

The last section presents the "protocol-packet count" matrix, essentially a set of histograms of the total packet sizes for IP and each transport protocol in the trace (in this case, ICMP, TCP, UDP, and Unknown).

 Bytes,IP,ICMP,TCP,UDP,Unknown
 38,1,0,0,1,0
 39,1,0,0,1,0
 40,160,0,153,7,0
 41,4,0,4,0,0
 43,2,0,0,2,0
 44,3,0,3,0,0
 45,3,0,0,3,0
 46,3,0,2,1,0
 48,305,0,305,0,0
 52,48,0,48,0,0
 53,3,0,0,3,0
 56,14,9,4,1,0
 57,1,0,1,0,0
 58,1,0,1,0,0
 60,5,0,4,1,0
 63,3,0,1,2,0
 64,11,0,10,1,0
 65,2,0,1,1,0
 66,2,0,1,1,0
 68,1,0,1,0,0
 70,2,0,0,2,0
 71,2,0,0,2,0
 72,7,0,0,4,3
 74,9,0,0,9,0
 75,6,0,0,6,0
 76,1,0,1,0,0
 78,1,0,0,1,0
 79,1,0,1,0,0
 80,1,0,1,0,0
 82,2,0,0,2,0
 84,4,0,3,1,0
 86,1,0,1,0,0
 88,12,0,12,0,0
 90,1,0,1,0,0
 92,13,13,0,0,0
 95,1,0,0,1,0
 96,2,0,2,0,0
 97,1,0,1,0,0
 98,1,0,1,0,0
 99,1,0,1,0,0
 101,1,0,1,0,0
 102,3,0,1,2,0
 108,2,0,1,1,0
 110,1,0,1,0,0
 112,1,0,1,0,0
 113,1,0,1,0,0
 114,1,0,0,1,0
 115,1,0,0,1,0
 120,4,0,0,4,0
 130,1,0,0,1,0
 138,2,0,0,2,0
 139,1,0,1,0,0
 141,1,0,0,1,0
 145,1,0,1,0,0
 146,1,0,0,1,0
 147,1,0,0,1,0
 149,1,0,0,1,0
 151,2,0,0,2,0
 164,2,0,0,2,0
 168,1,0,1,0,0
 178,1,0,0,1,0
 181,1,0,0,1,0
 182,4,0,1,3,0
 183,1,0,0,1,0
 184,1,0,0,1,0
 186,1,0,1,0,0
 188,1,0,0,1,0
 195,1,0,0,1,0
 199,3,0,0,3,0
 211,3,0,0,3,0
 217,1,0,0,1,0
 228,1,0,1,0,0
 234,2,0,0,2,0
 249,1,0,0,1,0
 254,1,0,0,1,0
 263,1,0,0,1,0
 265,1,0,0,1,0
 266,1,0,0,1,0
 267,1,0,1,0,0
 325,1,0,0,1,0
 330,2,0,2,0,0
 333,2,0,0,2,0
 339,1,0,0,1,0
 341,1,0,0,1,0
 343,1,0,0,1,0
 345,2,0,0,2,0
 354,1,0,0,1,0
 377,1,0,1,0,0
 404,12,0,0,12,0
 445,1,0,0,1,0
 472,1,0,1,0,0
 476,1,0,1,0,0
 488,1,0,1,0,0
 500,1,0,1,0,0
 504,1,0,1,0,0
 506,1,0,0,1,0
 512,1,0,0,1,0
 518,1,0,1,0,0
 521,1,0,0,1,0
 538,2,0,0,2,0
 632,1,0,1,0,0
 638,8,0,0,8,0
 647,2,0,0,2,0
 660,28,0,28,0,0
 680,1,0,1,0,0
 684,1,0,1,0,0
 706,21,0,21,0,0
 708,25,0,25,0,0
 712,1,0,1,0,0
 728,19,0,19,0,0
 920,1,0,1,0,0
 952,1,0,1,0,0
 999,1,0,1,0,0
 1000,1,0,1,0,0
 1020,1,0,1,0,0
 1039,2,0,2,0,0
 1048,1,0,1,0,0
 1168,1,0,1,0,0
 1273,2,0,2,0,0
 1400,18,0,18,0,0
 1420,66,0,66,0,0
 1427,1,0,1,0,0
 1454,21,0,21,0,0
 1480,6,0,6,0,0
 1492,2,0,2,0,0
 1500,34,0,34,0,0

Note that the largest recorded packet size is 1500 bytes.

AUTHOR ^

Kostas Pentikousis, kostas@cpan.org.

COPYRIGHT ^

Copyright 2004 by Kostas Pentikousis. All Rights Reserved.

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