LES Circuit 1000\100 - slow transfer time

Site one and two connected via a Virgin Media LES 1000\100 line
Going from Windows 2012 File server ate site one to my Windows 10 desktop at site two
Server is on 1GB NIC - Desktop probably 100mbs NIC
if I transfer a 30mb file between this two devices roughly how long should it take?

Just roughly - I am am see transfer time of between 5 to 7 mins

I've tried from different server at site one to different PC at site two and result is always the same.

Rough Network diagram attached

Any advice would be great

Ian PriceIT ManagerAsked:
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Pete LongTechnical ConsultantCommented:
Depends, whats the RTT (Round Trip Time = or latency on the circuit)

Just because its 100MB does not mean it has the same throughput as an on premise 100MB connection.
Ian PriceIT ManagerAuthor Commented:
Thank you Pete Long,

Using Ping Plotter on my PC at site 2 I have an average round trip of 3.1ms to the Nas box at site 1and it max out at 45ms while the file is being copied

How does that sound?

Pete LongTechnical ConsultantCommented:
Hi Ian,

Thanks for not making me have the latency/bandwidth conversation :)

Assuming 1% traffic loss (which is bad) then about 1 minute 30 seconds. In cases like yours I'd setup JPERF (or IPERF) on both sides and test the throughput with that, it will give you a better ides of whats going on :)

Also make sure all your LAN/WAN equipment has not auto-negotiated half duplex anywhere!

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Ian PriceIT ManagerAuthor Commented:
Hi Pete so with 1% traffic loss a 30mb file should take roughly about 1min 30sec? Is that correct? If so the 5-7mins is way off. How dp you get that calcualtion is there a netwrok speed calculator?

Thank for advice about Auto negotiated to half duplex I can certainly check the server and desktops but I don't have access to the ciscon kit

One more question what is JPERF (or IPERF)? Is it software and where would I run it from server to desktop or router to router?

Pete LongTechnical ConsultantCommented:
I use : http://wintelguy.com/wanperf.pl

JPerf: is a tool that you use to test the reliability and throughput of a network connection.

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Ian PriceIT ManagerAuthor Commented:
Thank you for your help Pete - I am going to close the question anyway however can you tell me the best place to download a JPerf tool?
Pete LongTechnical ConsultantCommented:
Iperf is the GUI front end, you might find that a bit easier, https://iperf.fr/iperf-download.php#windows

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