Latest LQ Deal: Latest LQ Deals
Go Back > Forums > Linux Forums > Linux - Software
User Name
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.


  Search this Thread
Old 05-08-2017, 07:22 AM   #1
LQ Newbie
Registered: May 2017
Posts: 5

Rep: Reputation: Disabled
show download speed in asymmetric network


here is my situation

(Client-Desktop) - Network - (Server-Desktop)

I am running ubuntu 14.04 64 bit on (Server-Desktop) with ip
I am running fedora 17 64 bit on (Client-Desktop) with ip

My network allows 600Mbps upstream and 1Gbps downstream .
I have to demonstrate 1Gbps downstream data rate.

(1)Currently I ran iperf3 as client on (Client-Desktop) and iperf3 as server on (Server-Desktop) .
Got throughput of 582Mbps .

(2)I ran an ftp server (vsftpd) on (Server-Desktop) and host a 1GB file then did
on client
wget -O- -o log_file --user=NAME --password='PASSWORD' ftp://server_dekstop_ip/file_in_home_folder &> /dev/null

Got 1Gbps download speed even if my network allows 1Mbps upload speed.

But , now there is hard disk storage constraint on server. So can't host a > 1GB file.

Is there a way to demonstrate 1Gbps downstream speed ?

Please let me know , if I missed any details.
Old 05-11-2017, 09:03 AM   #2
Registered: Mar 2006
Location: Czech Republic
Distribution: Gentoo, Chakra
Posts: 990
Blog Entries: 15

Rep: Reputation: 135Reputation: 135

I'd say iperf3 is a good test.
582Mbps is suspiciously close to 600Mbps, isn't it?
Have you run iperf the right way around?

from the iperf3 man page :
       -R, --reverse
              run in reverse mode (server sends, client receives)
by default, iperf client sends, and server receives. So from what I understand, you measured upstream performance with iperf.
1 members found this post helpful.
Old 05-17-2017, 10:44 AM   #3
LQ Newbie
Registered: May 2017
Posts: 5

Original Poster
Rep: Reputation: Disabled
sorry for late reply.
Seems , you want to say that iperf measures throughput in one direction.
So , If I ran client with -R then I should get 1Gbps.
I will do that and report back.
Old 05-18-2017, 06:08 AM   #4
LQ Newbie
Registered: May 2017
Posts: 5

Original Poster
Rep: Reputation: Disabled
thanks serafean .
Now I understand that iperf works in one direction , so pretty useful.
I think , there is a little bit of data activity (approx 3Mbps for 1Gbps throughput) in other direction too . Like , if packets are being sent from server to client (-R switch) then how will server display the throughput and jitter . Probably , client reports back to server the number of packets it processed and delay (for jitter measurement).

Also I was thinking if there was a way to download /dev/zero then we will tell wget to get first 1G bytes of that file.
That way , no space requirement on ftp server too.
So far , haven't got this working.

Last edited by is2014; 05-18-2017 at 06:10 AM. Reason: little question about ftp


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] Samba hell - asymmetric network speed displace Linux - Networking 1 09-10-2013 11:25 AM
Limiting download speed on a network Firefox54 Linux - Networking 1 05-11-2011 12:47 AM
Low level network interface download speed monitor Geneset Linux - Networking 2 11-06-2008 01:16 PM
Why is my internet upload speed greater than my download speed? km4hr Linux - Networking 1 05-27-2008 08:33 PM
is there a way to restrict users download speed on internal network? NuLLiFiEd Linux - Networking 3 10-06-2005 05:24 AM > Forums > Linux Forums > Linux - Software

All times are GMT -5. The time now is 12:30 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration