On 5/30/20 5:46 AM, Anand Buddhdev wrote:
On 30/05/2020 12:32, hw@xxxxxxxx wrote:
Hi hw,
I'm looking for a good way to create a constant data stream that will
occupy a
bandwidth of about 2--5Mbit/sec between two remote hosts over the
internet. I
have full access to the hosts involved.
My first attempt to use scp to copy data from /dev/null on host A to
/dev/null
on host B, but scp says '/dev/null: not a regular file'. If something
like
that would work, I would be able to limit the bandwidth of this
transfer in
the router(s) involved so that it won't occupy all the bandwidth.
You can't read from /dev/null. You get nothing from it. You're better
off using /dev/random, for example. That will give you a continuous
stream of random bytes.
I would recommend to read from /dev/zero instead, it will give you a
stream of zeroes. Using /dev/random is OK, but has one disadvantage in
the OP case: you exhaust machine's accumulated entropy which may be more
needed for other tasks (like ssh or ssl connections)...
Just my 2 cents.
Valeri
However, that's not the focus of this. You want a sustain a stream of
packets between two hosts. You're better off using UDP for this. And a
good tool for generating such packets would be "iperf". It can measure
bandwidth between two nodes more accurately.
Regards,
Anand
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
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