[c-nsp] FTP Throughput

[Amjad Ul Hasnain Qasmi]

TCP connection Throughput can never exceed beyond the ratio of RWIN and RTT
(Througput <= RWIN/RTT)
Reference http://en.wikipedia.org/wiki/TCP_tuning

Regards,

Amjad Ul Hasnain Qasmi


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joseph Mays
Sent: 30 November, 2011 1:25 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] FTP Throughput

Running tests on FTP throughput from a windows ftp client across two T3 hops

to an ftp server running on FreeBSD unix. Pretty much all the bandwidth on 
both T3's is available. Total latency averages about 3ms. The customer on 
the end of the t3 is complaining that they can't get faster than 600KB per 
second anywhere. I get about 1000KB (8mbps) on a file transfer. I can start 
multiple file transfers, simultaneously, all top out at about that speed. 
The customer is demanding to know why they can't transfer files at, say, 
40mbps. I am assuming the answer is something to do with TCP window size, 
but how do I prove that?

Joe

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