nanog mailing list archives
RE: Bandwidth issues in the Sprint network
From: "Frank Bulk" <frnkblk () iname com>
Date: Wed, 9 Apr 2008 09:28:40 -0500
Does anyone know of bootable Linux CD with iperf on it? Frank -----Original Message----- From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On Behalf Of Mike Gonnason Sent: Wednesday, April 09, 2008 9:05 AM To: nanog () merit edu Subject: Re: Bandwidth issues in the Sprint network On Tue, Apr 8, 2008 at 9:19 AM, Brian Raaen <braaen () 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 () zcorum comOn 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 () 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
Current thread:
- Bandwidth issues in the Sprint network Brian Raaen (Apr 07)
- Re: Bandwidth issues in the Sprint network Valdis . Kletnieks (Apr 07)
- Re: Bandwidth issues in the Sprint network Martin Hannigan (Apr 08)
- Re: Bandwidth issues in the Sprint network Brian Raaen (Apr 08)
- RE: Bandwidth issues in the Sprint network Matthew Evans (Apr 08)
- Re: Bandwidth issues in the Sprint network Sam Stickland (Apr 08)
- Re: Bandwidth issues in the Sprint network Brian Raaen (Apr 08)
- Re: Bandwidth issues in the Sprint network Mike Gonnason (Apr 09)
- RE: Bandwidth issues in the Sprint network Frank Bulk (Apr 09)
- Re: Bandwidth issues in the Sprint network Mike Gonnason (Apr 09)
- Re: Bandwidth issues in the Sprint network Michael Holstein (Apr 09)
- RE: Bandwidth issues in the Sprint network Murphy, William (Apr 09)
- Message not available
- RE: Bandwidth issues in the Sprint network Frank Bulk (Apr 10)
- Re: Bandwidth issues in the Sprint network Mike Gonnason (Apr 09)
- Re: Bandwidth issues in the Sprint network Mike Gonnason (Apr 17)
- RE: Bandwidth issues in the Sprint network Lincoln Dale (Apr 17)
- Re: Bandwidth issues in the Sprint network Chris Adams (Apr 17)
- <Possible follow-ups>
- Re: Bandwidth issues in the Sprint network Scott Weeks (Apr 07)
- RE: Bandwidth issues in the Sprint network Robert D. Scott (Apr 07)