topic Re: test Internet bandwidth speed in Communications and Wireless

test Internet bandwidth speed

'chris' — Fri, 04 Feb 2011 03:44:11 GMT

hi

How is the best way to test Internet bandwidth speed?

Re: test Internet bandwidth speed

Alzhy — Fri, 04 Feb 2011 15:22:05 GMT

From One Linux node to another accross the internet or local internet?

UNIX to UNIX (or Linux) I use:

ftp> put "dd if=/dev/zero bs=1024k count =100" /dev/null

That is pure network testing that does not involve Disk I/O

Re: test Internet bandwidth speed

Alzhy — Fri, 04 Feb 2011 15:22:33 GMT

Correction:

ftp> put "|dd if=/dev/zero bs=1024k count =100" /dev/null

Re: test Internet bandwidth speed

'chris' — Fri, 04 Feb 2011 16:03:43 GMT

Thx a lot, but can you pls give some more details what exactly does this command do?

Re: test Internet bandwidth speed

Alzhy — Fri, 04 Feb 2011 16:17:03 GMT

It reads from the zero device at a block size of 1MB up to 1000 times for a total of ~ 1GB (1024KB x 1000). Then the stream is written on the destination Linux or UNIX system to a NULL device -- so no DIsk I.O is involved.

I've always used this trick to see if the bandwidth I should be seeing is available -- i.e. to find out if my GigE or 10GbE pipe is working according to spec.

Re: test Internet bandwidth speed

rick jones — Fri, 04 Feb 2011 23:37:29 GMT

It does leave one at the mercy of FTP's selection of socket buffer and thus TCP window size, which can be quite important for "Internet" bandwidth.

Re: test Internet bandwidth speed

Alan_152 — Mon, 07 Feb 2011 16:25:02 GMT

dslreports.com

Re: test Internet bandwidth speed

'chris' — Tue, 08 Mar 2011 15:08:54 GMT

> Correction:

ftp> put "|dd if=/dev/zero bs=1024k count =100" /dev/null

I've tried on unix and linux and get this error:

unix sco:

ftp> put "|dd if=/dev/zero bs=1024k count =100" /dev/null
local: |dd if=/dev/zero bs=1024k count =100 remote: /dev/null
dd: bad arg: "count"
200 PORT command successful
550 /dev/null: No such file or directory

linux debian:

ftp> put "|dd if=/dev/zero bs=1024k count =100" /dev/null
local: |dd if=/dev/zero bs=1024k count =100 remote: /dev/null
dd: unrecognized operand `count'
Try `dd --help' for more information.
200 PORT command successful
550 /dev/null: No such file or directory

Re: test Internet bandwidth speed

Dennis Handly — Thu, 10 Mar 2011 11:16:32 GMT

>dd: bad arg: "count"

Cutting from your command, Alzhy and you shouldn't have a space before the "=".

Re: test Internet bandwidth speed

Reiner Rottmann — Fri, 11 Mar 2011 19:16:31 GMT

This may also come handy:
http://bwmon.sourceforge.net/

Re: test Internet bandwidth speed

'chris' — Sat, 12 Mar 2011 10:58:27 GMT

still doesn't work:

ftp> put "|dd if=/dev/zero bs=1024k count=100" /dev/null
?Invalid command

Re: test Internet bandwidth speed

Dennis Handly — Tue, 15 Mar 2011 05:55:47 GMT

>still doesn't work: ?Invalid command

I have no problems going from HP-UX to HP-UX, from Linux to Linux and from HP-UX to Linux.

Re: test Internet bandwidth speed

rick jones — Tue, 15 Mar 2011 15:37:37 GMT

I suppose you might try using the full path to the dd command, on the off chance that it isn't in $PATH for that context.

Re: test Internet bandwidth speed

sahaya — Tue, 03 May 2011 16:44:08 GMT

the best way to test your internet bandwidth is through this site. http://www.scanmyspeed.com/ try it.

here is my result.
downloads : 1.8Mbps
uploads : 0.8Mbps

i checked i through this site.