Networks

Inter-AZ cloud network performance

Archana Kesavan of ThousandEyes speaking at NANOG75 reports that network traffic between AZs within a single region is generally “reliable and consistent,” and that tested cloud providers offer a “robust regional backbone for [suitable for] redundant, multi-AZ architectures.”

ThousandEyes ran tests at ten minute intervals over 30 days, testing bidirectional loss, latency, and jitter. Kesavan reported the average inter-AZ latency for each tested cloud:

AWSAzureGCP
.82ms1.05ms0.79ms

Within the four tested regions in AWS, they found:

RegionLatency
us-east-10.92ms
ap-south-10.72ms
eu-west-20.61ms
sa-east-11.13ms

Kesavan’s slides and video are online.

Parts of a network you should know about

If you’re running infrastructure and applications on AWS then you will encounter all of these things. They’re not the only parts of a network setup but they are, in my experience, the most important ones.

The start of Graham Lyons’ introduction to networking on AWS, which (though the terms may change) is a pretty good primer for networking in any cloud environment. Though cloud infrastructure providers have to deal with things at a different later, Graham’s post covers the basics—VPCs, subnets, availability zones, routing tables, gateways, and security groups—that customers need to manage when assembling their applications.

WiFi Is Critical To Academia, The WiFi Alliance Says

study sponsored by the WiFi alliance reveals the following:

WiFi and college choice

  • 90% of college students say Wi-Fi access is as essential to education as classrooms and computers
  • 57% say they wouldn’t go to a college that doesn’t have free Wi-Fi
  • 79% say that without Wi-Fi access, college would be a lot harder
  • 60% agree that widely available Wi-Fi on campus is an indication that a school cares about its students

WiFi and where they use it

  • 55% have connected from coffee shops and restaurants
  • 47% from parks
  • 24% from in their cars

WiFi in the classroom

  • 55% have checked Facebook™ or MySpace™ and sent or received e-mail while using their laptop in class
  • 47% have sent instant messages to a friend during class
  • 44% used Wi-Fi to get a head start on an assignment before a class was finished

WiFi and linkbaiting statistics

  • If forced to choose, 48% would give up beer before giving up Wi-Fi

Survey methodology: “In conjunction with the Wi-Fi Alliance, Wakefield Research surveyed 501 U.S. college students in September 2008. The sampling variation in this survey is plus or minus 4.3 percentage points.”

[Insert Word Here] Is Hurting Your Network

Corporate networks are defenseless against the growing threat from instant messaging, and the government warns WiFi is insecure and easily sniffed.

Experts suggest we take precautions against the growing risk of p2p software that’s exposing sensitive documents and threatening national security.

Businesses blame security problems on their employees, their mobile devices, and other consumer technologies.

And now we have MySpace.

“Smart Networks” Are A Stupid-Bad Idea

This story in MIT Technology Review scares me. Instead of letting all computers within the network communicate freely, Ethane is designed so that communication privileges within the network have to be explicitly set; that way, only those activities deemed safe are permitted. “With hindsight, it’s a very obvious thing to do,” McKeown says. No matter […] » about 600 words