[c-nsp] FTP Throughput

[Joe Loiacono]

cisco-nsp-bounces at puck.nether.net wrote on 11/29/2011 04:24:15 PM:

>> On Nov 29, 2011, at 3:24 PM, Joseph Mays wrote:
>> 
>> 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?
> 
> do both UDP and TCP tests. 

For the UDP tests, check to see if there is packet loss.

With a RTT of 3ms, TCP window size won't matter.

Joe