Bandwidth issues in the Sprint network
Mike Gonnason
gonnason at gmail.com
Wed Apr 9 14:42:37 UTC 2008
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 <frnkblk at iname.com> 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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