[asterisk-users] Two way bandwidth test

[Matt Darnell]

On Wed, Jul 16, 2008 at 3:07 AM, Gordon Henderson
<gordon+asterisk at drogon.net> wrote:
> On Tue, 15 Jul 2008, Matt Darnell wrote:
>
>> Does anyone know of a bandwidth test that tests the upload with the download?
>>
>> All of the ones I can find will test the upload then the download.
>>
>> I from experience I have found that a 3M/768K DSL can only do about
>> 256K/256K simultaneously.
>
> You have a sucky ISP or router.
>
>> The only way I have of testing it is with FTP uploads and downloads or
>> P2P sharing.
>>
>> I would like something more formal that would keep the upload speed
>> the same as the download.  VoIP as you know is symmetric.
>>
>> The one VoIP test I find doesn't tell you how many calls you can
>> handle, just if it is VoIP ready.
>
> iperf
>
> You run a "server" on one site, and a "client" on the other.
>
> So on site a:
>
>   iperf -s -u
>
> then on the other site:
>
>   iperf -c ip.of.site.a  -u -b 80K -l 160
>
> That's a one-way test from site B to site A. To do a test both ways, one
> at a time:
>
>   iperf -c ip.of.site.a  -u -b 80K -l 160 -r
>
> To test both ways at the same time:
>
>   iperf -c ip.of.site.a  -u -b 80K -l 160 -d
>
> The -b parameter is the bandwidth to use, so start at 80K (one SIP link)
> and go up from there. The -l is the packet length - VoIP packets are
> typically 160 bytes.
>
> The one thing it can't do it send the packets in a timed manner -
> simulating an RTP stream... ie. it needs a "packets per second" parameter
> rather than a bandwidth parameter, but this is usually good enough to find
> gross problems with links, I've found.
>
> Gordon

iperf it is!

Thanks for the tip.

-Matt