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Re: Bandwidth issues in the Sprint network

  • From: Mike Gonnason
  • Date: Wed Apr 09 10:47:47 2008
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A quick search comes up with Scientific Linux, but I cannot provide
any claims to suitability. I have never even heard of it before, but
it is provided as a LiveCD.

http://linux.web.psi.ch/livecd/software.html

-Mike Gonnason

On Wed, Apr 9, 2008 at 6:28 AM, Frank Bulk <[email protected]> wrote:
>
>  Does anyone know of bootable Linux CD with iperf on it?
>
>  Frank
>
>
>  -----Original Message-----
>  From: [email protected] [mailto:[email protected]] On Behalf Of Mike
>  Gonnason
>  Sent: Wednesday, April 09, 2008 9:05 AM
>  To: [email protected]
>  Subject: Re: Bandwidth issues in the Sprint network
>
>
>
>
> On Tue, Apr 8, 2008 at 9:19 AM, Brian Raaen <[email protected]> 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
>  >  [email protected]
>  >
>  > > 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
>  >  > [email protected]
>  >  >
>  >
>
>  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
>
>