WAN throughput issue

We have a private P2P MPLS network set up between multiple sites.  My problem is:

Site A = 20Mbits
Site B = 20 Mbits
Site C =  6 Mbits

FTP file123 from Site A to Site B = 477 kbs
FTP file123 from Site B to Site A = 159 kbs

FTP file123 from Site A to Site C = 335 kbs
FTP file123 from Site C to Site A =   38 kbs

Any idea why sending the same sized file in one direction can have such a radical difference sending in the other direction?  Same FTP Host at Site A  for each of the tests.
helpdesk_wlkAsked:
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charles abtrimtechnical consultantCommented:
These is no guranteed way to tell unless you control every hop in the path.  I use a toll called PingPlotter.  This initially was developed by Nessoft and revently change to Pingman Tools.  I personally would have stayed with Nessoft.
https://www.pingplotter.com/
This will answer your question of why and give you evidence to prove it.  ISPs do not like this tool.  Its a must have is any Network Admins tool box.
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giltjrCommented:
When you are sending SITE C to SITE A, you can't send data any faster than 6 Mbps because that is as fast as SITE C can send.

Well when going from SITE A to SITE C you can send data at up to 20 Mbps, while receiving ACKs at up to 6 Mpbs.  Since ACK's are much smaller that a full packet of data and are not sent as often, you can send data much faster than when going from C to A.


As for SITE A to/from SITE B that could be a different in the receiver's window size.  It could be the host at SITE B has a bigger receive window size than the host at SITE A, it SITE A host can send more data to SITE B's host before it has to wait for an ACK.
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FideliusCommented:
Hello

Speed of FTP transfer depends on many things OS type, client, transfer mode, path MTU, router speed, fragmentation, link speed, etc.

To measure bandwidth you can use Iperf https://iperf.fr/
Here is good tutorial how to use it: http://openmaniak.com/iperf.php

Hope it will help!

Regards!
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charles abtrimtechnical consultantCommented:
You should try ping plotter standard.  It's free for 30 days.  I am positive you will identify the culprit hop causing this delay.
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