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Category Archives for "Networking"

A Skunk Works with tractors: Inside John Deere’s IoT-innovation unit

John Deere’s Intelligent Solutions Group is at the forefront of an IoT-based revolution in agriculture and the cutting edge of the firm’s aggressive development of technology to turn farming from an art into a science – a remarkable transformation for a company founded 180 years ago selling a self-scouring plow.The ISG, as Deere employees generally refer to it, has been around for about 15 years, and one of its first projects was to wire the company’s machines with cellular modems. According to John Deere director of technology John Teeple, the idea was what he called an “interior-focused value proposition” – the plan would have been to collect metrics from those modems in-house to study usage patterns.To read this article in full or to leave a comment, please click here

Microsoft’s DNA storage tech may fit in an enterprise

Microsoft has apparently firmed up its plans for a DNA-based storage device that it expects to be commercially available within about three years.The software giant originally unveiled its research into DNA as an archival storage medium last year; it described the technology being able to store the amount of data in "a big data center compressed into a few sugar cubes. Or all the publicly accessible data on the Internet slipped into a shoebox."That is the promise of DNA storage -- once scientists are able to scale the technology and overcome a series of technical hurdles," the company said in a 2016 blog post.To read this article in full or to leave a comment, please click here

Worth Reading: ISO 27018 for the cloud

Cloud computing technologies have revolutionized the way organizations manage and store their information. Where companies used to house and maintain their own data, a host of organizations have now made the switch to a cloud-based model due to the ease of use and cost-saving benefits promised by the cloud. But what is a cloud without a little rain? The benefits of cloud technologies have not come without their costs. —Cloud Security Alliance

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Power surge at British Airways data center causes flight chaos

A major British Airways crash has highlighted the importance for businesses of testing backup systems and disaster recovery procedures to ensure that they work as planned.The airline experienced what CEO Alex Cruz described as "a major IT systems failure" that, he said, affected all check-in and operational systems.The failure on Saturday, May 27, resulted in the delay or cancellation of hundreds of flights, leaving thousands of passengers stranded at London's Heathrow Airport on a holiday weekend. Things were still not back to normal two days later.Cruz described the cause of the failure as "a power supply issue," without going into detail.To read this article in full or to leave a comment, please click here

Power surge at British Airways data center causes flight chaos

A major British Airways crash has highlighted the importance for businesses of testing backup systems and disaster recovery procedures to ensure that they work as planned.The airline experienced what CEO Alex Cruz described as "a major IT systems failure" that, he said, affected all check-in and operational systems.The failure on Saturday, May 27, resulted in the delay or cancellation of hundreds of flights, leaving thousands of passengers stranded at London's Heathrow Airport on a holiday weekend. Things were still not back to normal two days later.Cruz described the cause of the failure as "a power supply issue," without going into detail.To read this article in full or to leave a comment, please click here

Is Anyone Using Open Daylight?

A while ago I sent out an email to my SDN and network automation mailing list (join here) asking whether anyone uses Open Daylight in anything close to a production environment (because I haven’t ever seen one).

Among many responses saying “not here” I got a polite email from VP of Marketing working for a company that sells OpenDaylight-related services listing tons of customer deployments (no surprise there).

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DNS OARC 26

OARC 26 was held in May in Madrid. Here are my impressions of the meeting, drawn from some presentations that I found to be of personal interest.

SREcon, DevOpsDays and Seattle vs Sillicon Valley

I am the Product Manager for StackStorm. This gives me the opportunity to attend several industry events. This year I attended SREcon in San Francisco, and devopsdays Seattle. I found both events interesting, but also found them more different than I expected.

SREcon Americas

This year SREcon Americas was held in San Francisco, a nice walk along the Embarcadero from where I live. This is bliss compared to my regular daily tour of the Californian outdoor antique railway museum, aka Caltrain.

According to the organizers, SREcon is:

…a gathering of engineers who care deeply about site reliability, systems engineering, and working with complex distributed systems at scale

That was pretty much true to form. Two things stood out to me:

  • The number of smart people, working on interesting problems
  • The number of companies aggressively hiring in this space.

I had many interesting conversations at SREcon. We had a booth, so would briefly start describing what StackStorm is, but would very quickly move past that. Conversations often went “Oh yeah, we’ve built something along those lines in-house, because there was nothing on the market back when we needed it. But I wouldn’t do it again. How did you solve <insert knotty Continue reading

SREcon, DevOpsDays and Seattle vs Sillicon Valley

I am the Product Manager for StackStorm. This gives me the opportunity to attend several industry events. This year I attended SREcon in San Francisco, and devopsdays Seattle. I found both events interesting, but also found them more different than I expected.

SREcon Americas

This year SREcon Americas was held in San Francisco, a nice walk along the Embarcadero from where I live. This is bliss compared to my regular daily tour of the Californian outdoor antique railway museum, aka Caltrain.

According to the organizers, SREcon is:

…a gathering of engineers who care deeply about site reliability, systems engineering, and working with complex distributed systems at scale

That was pretty much true to form. Two things stood out to me:

  • The number of smart people, working on interesting problems
  • The number of companies aggressively hiring in this space.

I had many interesting conversations at SREcon. We had a booth, so would briefly start describing what StackStorm is, but would very quickly move past that. Conversations often went “Oh yeah, we’ve built something along those lines in-house, because there was nothing on the market back when we needed it. But I wouldn’t do it again. How did you solve <insert knotty Continue reading

Learning Python: Week3 (Conditionals and For Loops) -Part 4

As discussed in post  ( https://crazyrouters.wordpress.com/2017/02/25/learning-python-kirk-byers-python-course/  ) , i will be sharing the my learning on weekly basis as course continues. This will not only motivate me but also help others who are in phase of learning python 3. This post will focus on Week 3 (Conditionals and For Loops) .This post will focus on […]

CCNA Wireless – CCNA Wireless Notes Chapter 3

Interference

Interference will exist if there are other transmitters on the same channel or adjacent channels. This will lead to loss of frames and the frames will then have to be retransmitted, using up air time. Interference can be caused by micro waves, DECT phones and other devices depending on the band used.

Co-Channel Interference

Co-Channel Interference occurs when two or more transmitters use the same channel. The signals completely overlap and the whole 20 or 22 MHz channel bandwidth is affected. This is only a problem if they transmit simultaneously though. However they will contend for the same airtime and a channel can become very congested. When two signals interfere, it causes data corruption, rentransmitting of frames and that in turn uses up even more airtime.

It is common practice to only place a transmitter on a specific channel where received signals are much weaker. A margin of 19 dB is recommended. The margin depends on the coding and modulation scheme. BPSK may need less than 10 db but 64-QAM will require 19 dB. More advanced modulation such as 256-QAM may require between 31 to 50 dB.

Neighboring Channel Interference

In the 2.4 GHz band neighboring Continue reading

Example of private VLAN isolation across Virtual and Physical servers using ESX/dvSwitch and HP Networking Comware switches

The target was simple, we have an internal cloud datacenter at work that provides users and customers both virtual machines and physical machines. Each machine has to network interface cards (NICs), one is in control of the user/customer using SDN layer, the secondary NIC is for our support to monitor and help troubleshoot these machines when needed. This second NIC will be our target today. In the past we used per-user or per-customer firewall separations that was configuration intensive nightmare, but was reliable. However since we learned private VLANs are now supported by vmWares Distributed vSwitch (dvSwitch), we immediately tried to make it cooperate with private VLANs on physical switches. And since it worked like a charm, let me share with you a quick lab example. But theory first!

Theory of separating management rail between different customers with and without private VLANs

Solving management separation with a lot of subnets and firewalls

Fortunately Private VLANs arrived for most major vendors and promissed the ability to have one giant subnet and separate every host from each other on L2 using some basic principle of declaring ports as either promiscuous (can talk to any other port type), community (can talk to ports Continue reading

Worth Reading: A few secrets of successful learning

Turn off every single distraction, put your phone into silent mode and leave it in another room, shut down all applications on your laptop (or tablet) and study. Also, don’t push it. You can’t absorb a complex topic in a few hours. Take a few small chunks at a time, try to understand them completely, think about them for a while (great ideas happen when your brain is totally bored while you’re brushing your teeth), figure out how you could use that knowledge in your network, and then proceed to the next chunk. —ipspace

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