Wireless Access

hi

How is the best way to test Internet bandwidth speed?

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

Correction:

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

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

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.

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.

dslreports.com

> 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

>dd: bad arg: "count"

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

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

still doesn't work:

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

>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.

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.

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.