Bandwidth issues in the Sprint network
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
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
Frank Bulk wrote:
> Does anyone know of bootable Linux CD with iperf on it?
> -----Original Message-----
> From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On Behalf Of
> 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
>> 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
>> tested against multiple networks and this has stayed the same.
>> Cacti graphs and the router I do get about 30Mbps total traffic
>> individual (flows/ip?) test always seem limited. I would like to know
>> 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.
>> 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
More information about the NANOG