Bandwidth issues in the Sprint network

Frank Bulk frnkblk at iname.com
Thu Apr 10 17:17:25 UTC 2008


I tried this on three laptops (two different models), and none of them would
fully boot.  They would lock up at different points.

Unless someone has some workarounds, I think I'll be trying another ISO
package.

Regards,

Frank

-----Original Message-----
From: Tim Peiffer [mailto:peiffer at umn.edu] 
Sent: Wednesday, April 09, 2008 9:50 AM
To: frnkblk at iname.com
Cc: nanog at merit.edu
Subject: Re: Bandwidth issues in the Sprint network

http://e2epi.internet2.edu/network-performance-toolkit/network-performance-t
oolkit.iso

Frank Bulk wrote:
> Does anyone know of bootable Linux CD with iperf on it?
>
> Frank
>
> -----Original Message-----
> From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On Behalf Of
Mike
> Gonnason
> Sent: Wednesday, April 09, 2008 9:05 AM
> To: nanog at merit.edu
> Subject: Re: Bandwidth issues in the Sprint network
>
>
> On Tue, Apr 8, 2008 at 9:19 AM, Brian Raaen <braaen at zcorum.com> wrote:
>
>> I have been using the Java based versions of the speed test.  At this
>>
> point I
>
>>  have had some Sprint people get in contact with me so I will see what
>>
> they
>
>>  find.  Thank you for all your help to everyone.
>>
>>  --
>>  Brian Raaen
>>  Network Engineer
>>  braaen at zcorum.com
>>
>>
>>> On Monday 07 April 2008, you wrote:
>>>
>>  > I am currently having problems get upload bandwidth on a Sprint
>>
> circuit. I
>
>>  am using a full OC3 circuit.  I am doing fine on downloading data, but
>>  uploading data I can only get about 5Mbps with ftp or a speedtest.  I
>>
> have
>
>>  tested against multiple networks and this has stayed the same.
>>
> Monitoring
>
>>  Cacti graphs and the router I do get about 30Mbps total traffic
outbound,
>>
> but
>
>>  individual (flows/ip?) test always seem limited.  I would like to know
if
>>  anyone else sees anything similar, or where I can get help.  The
>>
> assistance I
>
>>  have gotten from Sprint up to this point is that they find no problems.
>>
> Due
>
>>  to the consistency of 5Mbps I am suspecting rate limiting, but wanted to
>>  > know if I was overlooking something else.
>>  >
>>  > --
>>  > Brian Raaen
>>  > Network Engineer
>>  > braaen at zcorum.com
>>  >
>>
>>
>
> Most of the speed test sites on the Internet basically issue a HTTP
> GET request to a server and time the download. For upload they utilize
> a HTTP POST via a CGI script and time that. The main issue I have with
> these speed tests is that they only use a single TCP session for data
> transfer, which is fine if you have a large or self adjusting TCP
> window size and a relatively low latency link.
>
> However for high capacity links, it is unlikely (but possible) that
> you are planning to use a single TCP session and consume all the
> available capacity. Realistically you will have a few dozen
> server/applications/users and produce hundreds/thousands of TCP
> sessions which will fully utilize the link.
>
> For our PtP customers that have concerns regarding capacity, I
> generally they suggest setup iperf at both ends and run a few tests
> with multiple TCP sessions so they can independently verify. Hopefully
> Sprint will take your concerns to heart and assist you with testing.
>
> -Mike Gonnason
>




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