Archive for the ‘networking’ Category

OnLive Latency Tested

Thursday, July 8th, 2010

(reprinted from: Slashdot)

The Digital Foundry blog has done an analysis of recently launched cloud gaming service OnLive, measuring latency across several different games. Quoting: "In a best-case scenario, we counted 10 frames delay between button and response on-screen, giving a 150ms latency once the display's contribution to the measurement was removed. Unreal Tournament III worked pretty well in sustaining that response during gameplay. However, other tests were not so consistent, with DiRT 2 weighing in at 167ms-200ms while Assassin's Creed II operated at a wide range of between 150ms-216ms. ... OnLive says that the system works within 1000 miles of its datacenters on any broadband connection and recommends 5mbps or better. We gave OnLive the best possible ISP service we could find: Verizon FiOS, offering a direct fiber optic connection to the home. Latency was also reduced still further simply due to the masses of bandwidth FiOS offers compared to bog standard ADSL: in our case, 25mbps."

Read more of this story at Slashdot.

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Mother Earth Mother Board

Tuesday, July 15th, 2008

Published in Wired in 1996, this is still an excellent article written by Neal Stephenson, who travels across the globe to document how undersea communications cable are laid. While the article is very long (56 pages), it makes for fascinating reading.

FLAG, a fiber-optic cable now being built from England to Japan, is a skinny little cuss (about an inch in diameter), but it is 28,000 kilometers long, which is long even compared to really big things like the planet Earth. When it is finished in September 1997, it arguably will be the longest engineering project in history. Writing about it necessitates a lot of banging around through meatspace. Over the course of two months, photographer Alex Tehrani and I hit six countries and four continents trying to get a grip on this longest, fastest, mother of all wires. I took a GPS receiver with me so that I could have at least a general idea of where the hell we were. It gave me the above reading in front of a Chinese temple around the corner from the Shangri-La Hotel in Penang, Malaysia, which was only one of 100 peculiar spots around the globe where I suddenly pulled up short and asked myself, “What the hell am I doing here?”

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HOWTO – kill terminal services sessions remotely

Thursday, August 16th, 2007

This is a useful tip on those rare occasions when you absolutely need to get into a remote server and all of the connections are tied up.

While I’m sure we all agree that this is an awesome feature, sometimes in an emergency you need to log into a server and all of its connections are already in use. There are a couple of really useful and mostly unknown command line utilities that will allow you to remotely find and kill other remote desktop sessions, whether they are in a connected or disconnected state.

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Book: Where Wizards Stay Up Late

Wednesday, June 20th, 2007

Where Wizards Stay Up Late
Where Wizards Stay Up Late: The Origins of the Internet
by Katie Hafner and Matthew Lyon
Touchstone, 1998

In Where Wizards Stay Up Late, Hafner and Lyon take us all the way back to the earliest days of computer networking. We are introduced to all of the central figures that were responsible for building the precursors to the internet we know today. In contrast with the rapid growth we see now, the early days seem glacial. The equipment was primitive and had to be custom built. No one had any idea initially how they could connect disparate computers together and make them talk to one another. The fact that the protocols that they eventually came up with are still in use on the internet today, and have managed to survive its explosive growth, is a testament to the genius and vision of these pioneers. The authors have managed to capture not only the tough technical hurdles that needed to be overcome, but also the motivations and the leaps of insight of the people involved during this historic time. This is an enjoyable book that moves at a fairly brisk pace, but I wouldn’t have minded seeing a little more of the technical details.

Rating: 8/10

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Meet cGrid, the real-time P2P punisher

Tuesday, March 13th, 2007

A new tool has been announced in the piracy arms race. This tool can be deployed by network administrators to monitor network traffic in order to identify people using P2P services, and can automatically boot them off the network. The question is whether or not it can distinguish legitimate uses of those P2P technologies. The price: “$1 million price tag for installation and $250,000 yearly operation costs.”

Red Lambda says that cGrid monitors “a large variety of different P2P clients, in addition to other avenues of file-sharing including Windows file sharing, FTP, IM, and others,” and that cGrid does not perform content inspection but instead focuses on the behavior of the protocols being monitored. But the company does not expand on how it differentiates between legitimate uses of those technologies and illegal ones, raising questions of its effectiveness in an academic setting where students may be using P2P and other services potentially flagged by the system for legitimate, academic reasons.

Posted in networking, rights, security, technology | No Comments »

Downloads: PuTTY 0.59 (Windows, Unix)

Tuesday, January 30th, 2007

Grab the latest version of the PuTTY SSH client and associated utilities.

Posted in apps, downloads, networking, security | No Comments »

Pimp Your Router

Thursday, January 18th, 2007

I recently upgraded the firmware on my Linksys WRT54G router with the latest DD-WRT v23 SP2 firmware, and it works great. Among many other new features, I can now assign static DHCP leases, which I couldn’t do before with the stock Linksys firmware. The upshot is that now I don’t have to worry about updating my port forwarding setup whenever one of my machines’ wireless IP address changed.

If this sounds like something you’d like to try, check out the links below.

Warning: when flashing firmware, there is always a possibility of something going wrong during the process, which could potentially brick your router and render it inoperable. Make sure you understand what you are doing and the risks involved. It’s not my fault if you screw up your hardware!

It would also be a good idea to save all of the following pages locally to your computer so that you can still reference them if you lose your internet connection–particularly important if your wireless router is also your internet gateway.

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Bittorrent simulator

Wednesday, September 20th, 2006

This is an extremely cool java applet that graphically demonstrates how a file is shared over Bittorrent. Just add some seeds and peers and watch the packets fly!

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