I am looking a solution / answer for a querry related to FTP upload & download. However this querry is not directly related to Cisco, But reason for raising this problem in this forum is that i have searched a lot but did'nt find any convincing reply. If anyone of you can spend some time on this to reply. please...
1) We are a ISP at India. We are getting querry related to USA sites/FTP (Download & Upload) from our customers since couple of time.
Problem :- Customers/We are not getting upload / download transfer rate more then 1.8 - 2Mbps even on high bandwidth at our customer backend. i.e DS3 or STM-1. in short in all cases/bandwidth the upload & download for USA sites/FTP are not reaching beyond 2 Mbps.
We have checked all our peering / routing all fine and infact tryed different-different combinations/routing but the response from abroad sites are still not more then 2 Mbps even with best possible combinations.
2) For Eg:- a customer having 4 Mbps(1:1) internet link from us. Hence the standard transfer rate should be 512KB/s(or close to this) while upload & download. But while downloading or upload to FTP servers. sometime we are getting Channelised response (transfer rate) in multiple sessions. i.e 256KB/s in one and 256KB/s in other, so total 512KB/s. question is what are the all possible reasons that why we are not getting the full or even close to full transfer rate in single session (512KB/s).
3) What are the factors which impacting the download / upload response except routing. How we can get know or investigate that particular FTP server having bandwidth contraints or having policy configured to limit the upload/download session..
4) If anyone have some good documents on FTP/ Upload or Download working with key points...kindly share