Once upon a time, Lincoln Dale <[EMAIL PROTECTED]> said:
> even with tuned TCP window sizes, make sure you don't have TCP syncookies
> enabled on either endpoint.
IIRC Linux (at least) syncookies only come into play when you are being
syn-flooded (i.e. when the kernel has to start dropping syns).
] On Behalf Of Brian
> Raaen
> Sent: Friday, 18 April 2008 7:00 AM
> To: nanog@merit.edu
> Subject: Re: Bandwidth issues in the Sprint network
>
> Some people wanted to know what I found the problem to be. I have
> discovered.
> the problem for a fact is the TCP window s
On Thu, Apr 17, 2008 at 1:00 PM, Brian Raaen <[EMAIL PROTECTED]> wrote:
> Some people wanted to know what I found the problem to be. I have discovered.
> the problem for a fact is the TCP window size on uploads. I have a Linux box
> that I changed the Window sizes to match and I still get 32k
Some people wanted to know what I found the problem to be. I have discovered.
the problem for a fact is the TCP window size on uploads. I have a Linux box
that I changed the Window sizes to match and I still get 32k on a upload
window and 64k on a download window. With a ping time of 50ms I h
I think the web100 NDT tests are the most accurate.
http://netspeed.stanford.edu. you can find out more info about web100
at http://www.web100.org/ Also there is a list of other sites at the
bottom of that stanford site.
Good idea, but the other side doesn't have a Cisco box.
Frank
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 09, 2008 11:02 AM
To: Michael Holstein
Cc: [EMAIL PROTECTED]; nanog@merit.edu
Subject: Re: Bandwidth issues in the Sprint ne
EMAIL PROTECTED]
Sent: Wednesday, April 09, 2008 9:50 AM
To: [EMAIL PROTECTED]
Cc: nanog@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
You can also use ttcp from the command line, useful if its cisco on both ends
of the circuit.
sr01#ttcp
transmit or receive [receive]: transmit
Target IP address: 1.1.1.1
calculate checksum during buffer write [y]:
perform tcp half close [n]:
send buflen [32768]:
send nbuf [2048]:
bufalign [
: [EMAIL PROTECTED]
Cc: nanog@merit.edu
Subject: Re: Bandwidth issues in the Sprint network
> Does anyone know of bootable Linux CD with iperf on it?
>
Knoppix STD (security tools distro)
http://www.knoppix-std.org/tools.html
Cheers,
Michael Holstein
Cleveland State University
Does anyone know of bootable Linux CD with iperf on it?
Knoppix STD (security tools distro)
http://www.knoppix-std.org/tools.html
Cheers,
Michael Holstein
Cleveland State University
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: nanog@merit.edu
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: nanog@merit.edu
Subject: Re: Bandwidth issues in the Sprint network
On Tue, Apr 8
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.
>
>
>
>
> --
> B
On Tue, 8 Apr 2008, Scott Weeks wrote:
To other medium-sized eyeball network providers (I'm defining medium
size as 50-150K DSL/Cable connections and 50-1500 leased line
customers): are you seeing this and what do you tell your customers?
We're having this big push here in Sweden with someth
On Tue, Apr 8, 2008 at 11:15 AM, Scott Weeks <[EMAIL PROTECTED]> wrote:
> This brings up a PITA point for me. Recently, I have seen a rash of
> "Speedsite test server at says blah, blah, blah" tickets finally
> reach me and I am telling everyone they're not an accurate way to measure
> netwo
n the right direction.
Frank
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Scott Weeks
Sent: Tuesday, April 08, 2008 1:16 PM
To: nanog@merit.edu
Subject: Speedtest site accuracy [was: Bandwidth issues in the Sprint
network]
--- [EMAIL PROTECTED] wrote:
--- [EMAIL PROTECTED] wrote:
Try using the Java test on DSLReports rather than the Flash based test. I've
found it to be much more accurate. I also receive the message about compression
being used when I test with the flash test. I think it may be a bug.
--
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:
>
Could be your TCP window size? A 17520 byte TCP window (Windows 2000)
will cause a single flow to top out at 5Mbps at about 50ms. What is the
latency on the link?
Try some figures here and see what limit you might be hitting:
http://www.wand.net.nz/~perry/max_download.php?bits_per_second=155
nanog@merit.edu
Subject: Re: Bandwidth issues in the Sprint network
Currently there is not a proxy server in the network, although when using some
of the test on dslreports.com there is a message about compression being used
for the upload and to remove proxy settings. I have also been testing using
F
Currently there is not a proxy server in the network, although when using some
of the test on dslreports.com there is a message about compression being used
for the upload and to remove proxy settings. I have also been testing using
FTP on a *nix server as well. Both the server and PC are con
Has this circuit ever run clean(normal)?
-M<
On Mon, Apr 7, 2008 at 1:06 PM, Brian Raaen <[EMAIL PROTECTED]> 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 on
--- [EMAIL PROTECTED] wrote: ---
I would like to second the recommendation and go one further. Internet2
has released a performance toolkit that is run from CD. I would like to
--
Robert D. Scott wrote:
> See if you can find a nother connect
: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Scott Weeks
Sent: Monday, April 07, 2008 5:24 PM
To: nanog@merit.edu
Subject: Re: Bandwidth issues in the Sprint network
--- [EMAIL PROTECTED] wrote:
I am currently having problems get upload bandwidth on a Sprint circuit. I
am using a
--- [EMAIL PROTECTED] 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
On Mon, 07 Apr 2008 15:06:21 EDT, Brian Raaen said:
> 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.
TCP window size tuning? I'd look there first...
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
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