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

Docker Security at PyCon: Threat Modeling & State Machines

The Docker Security Team was out in force at PyCon 2017 in Portland, OR, giving two talks focussed on helping the Python Community to achieve better security. First up was David Lawrence and Ying Li with their “Introduction to Threat Modelling talk”.

Threat Modelling is a structured process that aids an engineer in uncovering security vulnerabilities in an application design or implemented software. The great majority of software grows organically, gaining new features as some critical mass of users requests them. These features are often implemented without full consideration of how they may impact every facet of the system they are augmenting.

Threat modelling aims to increase awareness of how a system operates, and in doing so, identify potential vulnerabilities. The process is broken up into three steps: data collection, analysis, and remediation. An effective way to run the process is to have a security engineer sit with the engineers responsible for design or implementation and guide a structured discussion through the three steps.

For the purpose of this article, we’re going to consider how we would  threat model a house, as the process can be applied to both real world scenarios in addition to software.

threat Modeling

Data Collection

Five categories of 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

The post Worth Reading: A few secrets of successful learning appeared first on rule 11 reader.

It’s Not The Size of Your Conference Community

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Where do you get the most enjoyment from your conference attendance? Do you like going to sessions and learning about new things? Do you enjoy more of the social aspect of meeting friends and networking with your peers? Maybe it’s something else entirely?

It’s The Big Show

When you look at shows like Cisco Live, VMworld, or Interop ITX, there’s a lot going on. There are diverse education tracks attended by thousands of people. You could go to Interop and bounce from a big data session into a security session, followed by a cloud panel. You could attend Cisco Live and never talk about networking. You could go to VMworld and only talk about networking. There are lots of opportunities to talk about a variety of things.

But these conferences are huge. Cisco and VMware both take up the entire Mandalay Bay Convention Center in Las Vegas. When in San Francisco, both of these events dwarf the Moscone Center and have to spread out into the surrounding hotels. That means it’s easy to get lost or be overlooked. I’ve been to Cisco Live before and never bumped into people I know from my area that said they Continue reading

Top 5 misconceptions of IoT network and device security

Security in multiplesImage by ShutterstockThe Internet of Things (IoT) describes an interconnected system of standalone devices, which communicate and transfer data within the existing internet infrastructure, providing greater insight and control over elements in our increasingly connected lives. With an estimated 30 billion connected devices to be deployed across the globe by 2020, the promise of a global Internet of Things is fast approaching, posing a whole new level of threats to connected organizations. To a potential attacker, a device presents an interesting target for several reasons. First, many of the devices will have an inherent value by the simple nature of their function. A connected security camera, for example, could provide valuable information about the security posture of a given location when compromised. Hackers are already using IoT devices for their malicious purposes in multiple types of attacks on networks and servers. DSL, DDoS and bot attacks in 2016 have proven that there is no shortage of opportunities that hackers are willing to exploit. Portnox explains these common misconceptions.To read this article in full or to leave a comment, please click here

Top 5 misconceptions of IoT network and device security

Security in multiplesImage by ShutterstockThe Internet of Things (IoT) describes an interconnected system of standalone devices, which communicate and transfer data within the existing internet infrastructure, providing greater insight and control over elements in our increasingly connected lives. With an estimated 30 billion connected devices to be deployed across the globe by 2020, the promise of a global Internet of Things is fast approaching, posing a whole new level of threats to connected organizations. To a potential attacker, a device presents an interesting target for several reasons. First, many of the devices will have an inherent value by the simple nature of their function. A connected security camera, for example, could provide valuable information about the security posture of a given location when compromised. Hackers are already using IoT devices for their malicious purposes in multiple types of attacks on networks and servers. DSL, DDoS and bot attacks in 2016 have proven that there is no shortage of opportunities that hackers are willing to exploit. Portnox explains these common misconceptions.To read this article in full or to leave a comment, please click here

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