Arghhh - Help
by James Pluck
(I apologise for the spam if you've gotten this twice. I think the email I
originally sent it from is not subscribed to this list).
Hi all!
I'm in a bit of a bind. We're experiencing very poor connectivity at
the moment from Slingshot. We're lucky to be able to stay online for
more than 3 minutes at a time. I've just called Slingshot support and a
very bored woman who sounded like it was beneath her to even talk to me
was very unhelpful. refused to run any checks on the line or check logs
or anything at their end unless I tried an alternative router on the
line. She basically wanted me off the phone as fast as possible -
presumably so she could get back to her WoW game or Puzzle Pirates or
something more important than actual customer support (I tell you - if
we had someone who behaved like that to customers at Quicksilver they'd
be on notice pretty bloody fast!)
Anyway - does anyone have a spare adsl router that I could borrow for a
day or so to do some troubleshooting and see if it is my problem or
Slingshot's problem. I'm in the process of choosing another provider
because we've not been hapy with the service from Slingshot for some
time but I'd kinda like to work out if it's a hardware issue or a
connection issue before we switch.
If I had the knowledge and the skills I'd probably just bite the bullet
and rewire the jackpoints in this house - the current phone wiring seems
a little amateurish - but we've had no troubles with any
telecommunications services up until a couple of weeks ago. I have a
drum of cat 5 but no skills on how to use it - *sigh*
anyways - if anyone has a spare serviceable adsl router they would be
willing to loan me I would be most grateful!
James.
--
James Pluck
PalmOS Ergo Sum
"Dear IRS: I would like to cancel my subscription.
Please remove my name from your mailing list..."
12 years, 5 months
Network latency simulation
by Glenn Ramsey
Hi,
In order to test some software I am developing I need to introduce a
network delay between a machine and the rest of my LAN.
After a bit of web searching I discovered that this is supposed to be
simple to do, you just set up Linux as a transparent bridge and use the
iproute tools to simulate network behaviour. However I can't get it to
work how I want.
I have an old AMD K6/500 box with 2 10bT ethernet cards running Xubuntu
7.10. One card is connected to my office LAN switch and the other to a
hub, like this:
MachineA---switch---eth0/bridge/eth1---hub---MachineB
I have installed bridge-utils and iproute and I have configured the
bridge machine according to the bridge-utils documentation by removing
the eth0 and eth1 entries and adding a br0 to /etc/network/interfaces :
auto br0
iface br0 inet static
address 192.168.1.251
network 192.168.1.0
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1
bridge_ports eth0 eth1
This works fine and MachineB can get an address via DHCP and see the
rest of the network.
Now I need to add a delay so that all traffic between MachineB and the
rest of the network has some latency.
In order to add a delay, according to [1] I just need to do this:
$ tc qdisc add dev DEV root netem delay 100ms
I have done this for various combinations of eth0, eth1 and br0 but it
only seems to delay traffic to and from the bridge itself, not traffic
being relayed through the bridge.
Does anyone know how to set this up to delay traffic going through the
bridge?
Glenn
[1]
http://www.linux-foundation.org/en/Net:Netem#Emulating_wide_area_network_...
--
Glenn Ramsey <glenn(a)componic.co.nz> 07 8627077
http://www.componic.co.nz
12 years, 6 months
Fwd: "Open Source DataTurbine Initiative" Biology lunchtime seminar tomorrow (fwd)
by Ian McDonald
---------- Forwarded message ----------
From: Tony McGregor <tonym(a)waikato.ac.nz>
Date: Nov 26, 2007 10:22 AM
Subject: "Open Source DataTurbine Initiative" Biology lunchtime
seminar tomorrow (fwd)
To: cs-staff(a)cs.waikato.ac.nz
> Open Source DataTurbine Initiative
>
> Tony Fountain, Paul Hubbard, Sameer Tilak, Ilya Zaslavsky
> University of California, San Diego
>
> The vision of large-scale sensor-based Observing Systems, to address
> the U.S. National Research Council's "Grand Challenges" for
> environmental science, relies on robust cyberinfrastructure. Streaming
> data middleware is an essential component of this cyberinfrastructure,
> providing the foundation for reliable data acquisition and instrument
> management services. The environmental science and engineering
> communities are currently engaged in the early planning and
> development phases of the next generation of large-scale sensor-based
> observing systems. The Open Source DataTurbine Initiative is a new
> NSF-funded project to empower these communities with Streaming Data
> Middleware.
>
> Large-scale sensor-based observing systems face a number of
> significant challenges in design and operations, including
> heterogeneity of instrumentation and complexity of data stream
> processing. These systems incorporate instruments from across the
> spectrum of complexity, from temperature sensors to acoustic Doppler
> current profilers, to streaming video cameras. They typically require
> integration of instruments from various vendors and R&D labs.
> Requirements on the cyberinfrastructure include scalable and secure
> support for real-time data acquisition, instrument and data stream
> management, and analysis and visualization. To address these
> cyberinfrastructure challenges in a principled manner, we launched the
> Open Source DataTurbine Initiative.
>
> DataTurbine is a robust open-source streaming data middleware system
> that satisfies the core requirements for sensor-based environmental
> observing systems. It is relatively mature and has been tested in a
> variety of real-world streaming data applications. It facilitates the
> development of complex distributed streaming data applications,
> including real-time virtual observatories and telepresence
> collaboratories. The Open Source DataTurbine Initiative combines
> commercial-quality software support with an active and engaged user
> and developer community. In this talk we share our vision and invite
> domain scientists and developers to join the Open Source DataTurbine
> Initiative. We also discuss our experiences and results from
> real-world deployments of DataTurbine. Further details about the Open
> Source DataTurbine Initiative can be found at:
> http://www.dataturbine.org
>
>
> When: Tues 27th Nov 12:00noon
> Where: Room A.G.30
>
> <<37 sem 271107 Fountain.doc>>
> Vicki Smith
> Administrative Assistant
> Biological Sciences
> The University of Waikato
> Private Bag 3105
> Hamilton
>
> Ph 838 4148
> Fax 838 4324
>
>
--
Web1: http://wand.net.nz/~iam4/
Web2: http://www.jandi.co.nz
Blog: http://iansblog.jandi.co.nz
12 years, 6 months
Fwd: "Open Source DataTurbine Initiative" Biology lunchtime seminar tomorrow (fwd)
by Ian McDonald
---------- Forwarded message ----------
From: Tony McGregor <tonym(a)waikato.ac.nz>
Date: Nov 26, 2007 10:22 AM
Subject: "Open Source DataTurbine Initiative" Biology lunchtime
seminar tomorrow (fwd)
To: cs-staff(a)cs.waikato.ac.nz
> Open Source DataTurbine Initiative
>
> Tony Fountain, Paul Hubbard, Sameer Tilak, Ilya Zaslavsky
> University of California, San Diego
>
> The vision of large-scale sensor-based Observing Systems, to address
> the U.S. National Research Council's "Grand Challenges" for
> environmental science, relies on robust cyberinfrastructure. Streaming
> data middleware is an essential component of this cyberinfrastructure,
> providing the foundation for reliable data acquisition and instrument
> management services. The environmental science and engineering
> communities are currently engaged in the early planning and
> development phases of the next generation of large-scale sensor-based
> observing systems. The Open Source DataTurbine Initiative is a new
> NSF-funded project to empower these communities with Streaming Data
> Middleware.
>
> Large-scale sensor-based observing systems face a number of
> significant challenges in design and operations, including
> heterogeneity of instrumentation and complexity of data stream
> processing. These systems incorporate instruments from across the
> spectrum of complexity, from temperature sensors to acoustic Doppler
> current profilers, to streaming video cameras. They typically require
> integration of instruments from various vendors and R&D labs.
> Requirements on the cyberinfrastructure include scalable and secure
> support for real-time data acquisition, instrument and data stream
> management, and analysis and visualization. To address these
> cyberinfrastructure challenges in a principled manner, we launched the
> Open Source DataTurbine Initiative.
>
> DataTurbine is a robust open-source streaming data middleware system
> that satisfies the core requirements for sensor-based environmental
> observing systems. It is relatively mature and has been tested in a
> variety of real-world streaming data applications. It facilitates the
> development of complex distributed streaming data applications,
> including real-time virtual observatories and telepresence
> collaboratories. The Open Source DataTurbine Initiative combines
> commercial-quality software support with an active and engaged user
> and developer community. In this talk we share our vision and invite
> domain scientists and developers to join the Open Source DataTurbine
> Initiative. We also discuss our experiences and results from
> real-world deployments of DataTurbine. Further details about the Open
> Source DataTurbine Initiative can be found at:
> http://www.dataturbine.org
>
>
> When: Tues 27th Nov 12:00noon
> Where: Room A.G.30
>
> <<37 sem 271107 Fountain.doc>>
> Vicki Smith
> Administrative Assistant
> Biological Sciences
> The University of Waikato
> Private Bag 3105
> Hamilton
>
> Ph 838 4148
> Fax 838 4324
>
>
--
Web1: http://wand.net.nz/~iam4/
Web2: http://www.jandi.co.nz
Blog: http://iansblog.jandi.co.nz
12 years, 6 months
