From: J Webb (jon_webb@binary-one.com)
Date: 05/30/03
Message-ID: <3ED825B8.5000801@binary-one.com> Date: Fri, 30 May 2003 20:47:04 -0700 From: J Webb <jon_webb@binary-one.com> Subject: tcptrace question about throughput calc
Hi guys.. This is kinda unusual. I am trying to run tcptrace on a pcap
dump file created using a network simulator. The pcap file for the most
part looks just like any other pcap dump file from a real network. This
includes the timestamps (which are good). All the utilities I run on it
seem to give me good graphs/data for RTT and sequence numbers / time.
Both tcptrace and ethereal's plugin for plotting throughput show a
fairly constant throughput (what I expect) but at around 4.5MB/s. This
is completely wrong. The simulator says throughput is more like 1.5 mega
BITS/s (on an 11mbit link) which makes a lot more sense given the
topology of the network. I calculated overall throughput from the amount
of data transferred and the beginning and end timestamps in the pcap
file and it also appears to be 1.5mbits/s.
So does anyone have a clue as to why the throughput number for tcptrace
would be so inflated given the facts stated above? Is there some problem
with my tcp headers or data payloads? I've noticed the sequence number
graph is pretty unreadable too :(
Help!
- Jon
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