Understanding IPv6: A Sniffer Full Of 3s (Part 3 of 7)

“What the heck?” Yup, that pretty much summed up my confusion the first time I saw it. A sniffer trace full of threes.

The first thing it reminded me of was my days with Token Ring and locally administered addresses (LAAs). This was for two reasons:

  1. I could only see these MAC addresses being used as destination MACs, not as source MACs. This was the same with my experience with LAAs in token ring
  2. The MAC addresses seemed so pretty and clean, like the Token Ring LAA typically used for a 3745 IBM front-end process — 4000.3745.0001. Just look at them. Four threes, followed by a bunch of zeros, and then just one little number.

Help from Wireshark

I hope you are familiar with Wireshark; I use it all the time. It shows “reality” on the wire, which is crucial if you are a network detective trying to solve a whodunit.

If you are familiar with Wireshark then you might know that I can configure how the MAC addresses are displayed in the columns via the Wireshark preferences. As you can see below, I have set the preferences to not resolve the MAC addresses for me, Continue reading

Understanding IPv6: A Sniffer Full Of 3s (Part 3 of 7)

“What the heck?” Yup, that pretty much summed up my confusion the first time I saw it. A sniffer trace full of threes.

The first thing it reminded me of was my days with Token Ring and locally administered addresses (LAAs). This was for two reasons:

  1. I could only see these MAC addresses being used as destination MACs, not as source MACs. This was the same with my experience with LAAs in token ring
  2. The MAC addresses seemed so pretty and clean, like the Token Ring LAA typically used for a 3745 IBM front-end process — 4000.3745.0001. Just look at them. Four threes, followed by a bunch of zeros, and then just one little number.

Help from Wireshark

I hope you are familiar with Wireshark; I use it all the time. It shows “reality” on the wire, which is crucial if you are a network detective trying to solve a whodunit.

If you are familiar with Wireshark then you might know that I can configure how the MAC addresses are displayed in the columns via the Wireshark preferences. As you can see below, I have set the preferences to not resolve the MAC addresses for me, Continue reading

리눅스에서 Go를 스크립트 언어로 사용하기

리눅스에서 Go를 스크립트 언어로 사용하기

This is a Korean translation of a prior post by Ignat Korchagin.

Cloudflare에서는 Go를 좋아합니다. Go는 많은 내부 소프트웨어 프로젝트와 거대한 파이프라인 시스템의 일부로도 사용되고 있습니다. 하지만 Go를 한단계 더 끌어 올려서 우리가 선호하는 운영체제인 리눅스의 스크립트 언어로 사용할 수 있을까요?

리눅스에서 Go를 스크립트 언어로 사용하기
gopher image CC BY 3.0 Renee French | Tux image CC0 BY OpenClipart-Vectors

Go를 왜 스크립트 언어로 고려하는가

간단한 답은: 왜 안되나요? Go는 비교적 쉽게 배울 수 있고 아주 복잡하지도 않고, 코드를 처음부터 작성해야 하는 일을 피하기 위해 재사용 가능한 라이브러리의 거대한 에코시스템이 있습니다. 추가로 다음과 같은 잠재적인 장점이 있습니다:

  • 여러분의 Go 프로젝트를 위한 Go 기반 빌드 시스템: go build 명령은 대부분의 소규모이며 독립적인 프로젝트에 적합합니다. 더 복잡한 프로젝트는 대부분 별도의 빌드 시스템/스크립트 세트를 채용하고 있습니다. 이런 스크립트도 Go로 작성 가능하지 않을까요?
  • 바로 이용 가능한 별도 권한 없는 패키지 관리: 여러분의 프로그램에서 서드 파티 라이브러리를 사용하고 싶다면 단순히 go get 을 사용하면 됩니다. 그리고 이 코드가 여러분의 GOPATH에 설치되므로, 서드파티 라이브러리를 받는 것은 시스템의 별도 운영 권한을 필요로 하지 않습니다(다른 일부 스크립트 언어와 달리). 이것은 대규모의 기업 환경에서 특히 유용합니다.
  • 초기 단계 프로젝트를 위한 빠른 코드 프로토타이핑: 최초로 돌아가는 코드를 작성할 때 컴파일 되기 위해서 많은 편집을 해야 하고 "편집->빌드->체크" 사이클을 위해 많은 키보드 입력을 Continue reading

New to the INE Video Course Library: Introduction to Azure Design and Implementation

Last week we added a new Azure course to our video library. This is the first course of it’s kind and can be found on the INE streaming site and also for sale on ine.com

 

Why Study Azure:
Azure is Microsoft’s version of web services management. Azure is a great option for DevOps professionals due to it’s diversity. Azure allows you to create intelligent apps using the language of your choice, including Node.js, Java and .NET, and works for both PC and Mac users. With 100+ services and tools to manage apps, Azure Design has become a favorite among many large companies and should be considered an essential study topic for DevOps professionals.

About the course:
Length- 1 hour 23 minutes
Instructor- Gary Bushey

In this Series we will take a look at what Azure is, including what IaaS, PaaS, and SaaS mean. We will thoroughly discuss Azure PaaS and some of the specific technologies used with PaaS, namely containers and artificial intelligence.

In the second section, we will discuss how to move your applications to Azure. The first video will provide an introduction to the Architectural decisions to make when moving your application, including which style Continue reading

Enterprise versus Provider?

Two ideas that are widespread, and need to be addressed—

FANG (read this hyper/web/large scale network operators) have very specific needs; they run custom-built single-purpose software in a very big scale. So all the really want/need are dumb boxes and smart people. … Enterprise have another view, they want smart boxes run by dumb people.

First, there is no enterprise, there are no service providers. There are problems, and there are solutions.

When I was young (and even more foolish than I am now) I worked for a big vendor. When this big vendor split the enterprise and service provider teams, I thought this kindof made sense. After all, providers have completely different requirements, and should therefore run with completely different technologies, equipment, and software. When I thought of providers in those days, I thought of big transit network operators, like AT&T, and Verizon, and Orange, and Level3, and Worldcom, and… The world has changed since then, but our desire to split the world into two neat halves has not.

If you want to split the world into two halves, split it this way: There are companies who consider the network an asset, and companies that consider the network a Continue reading

IDG Contributor Network: Are you ready for your building’s ‘Super Bowl’ of wireless demand?

Beyond the record-setting day of total offense generated in the Philadelphia Eagles' thrilling 41-33 win over the New England Patriots in Super Bowl 52, there was also a record 16.31 terabytes of Wi-Fi data used during the game, the most ever reported for a single-day, single-building event.While you probably won't have to worry about having almost 70,000 people show up at your building for the day, there are plenty of lessons for any big-building owner or operator to learn from how U.S. Bank Stadium in Minneapolis prepared for its "super" wireless stress test, and how you might better prepare for your own big-demand wireless days, whenever they might arrive.To read this article in full, please click here

Machine Learning with a Memristor Boost

On today’s podcast episode of “The Interview” with The Next Platform, we talk with computer architecture researcher Roman Kaplan about the role memristors might play in accelerating common machine learning algorithms including K-means. Kaplan and team have been looking at performance and efficiency gains by letting ReRAM pick up some of the data movement tab on traditional architectures.

Kaplan, a researcher at the Viterbi faculty of Electrical Engineering in Israel, along with his team, have produced some interesting benchmarks comparing K-means and K-nearest neighbor computations on CPU, GPU, FPGA, and most notably, the Automata Processor from Micron to their …

Machine Learning with a Memristor Boost was written by Nicole Hemsoth at The Next Platform.

Add Firepower to Your Data with HPC-Virtual GPU Convergence

High performance computing (HPC) enables organizations to work more quickly and effectively than traditional compute platforms—but that might not be enough to succeed in today’s evolving digital marketplace.

Mainstream HPC usage is transforming the modern workplace as organizations utilize individually deployed HPC clusters and composable infrastructures to increase IT speed and performance and help employees achieve higher levels of productivity. However, maintaining disparate and isolated systems can pose a significant challenge—such as preventing workloads from reaching optimal efficiency. By converging the muscle of HPC and virtualized environments, organizations can deliver a superior virtual graphics experience to any device in order …

Add Firepower to Your Data with HPC-Virtual GPU Convergence was written by Nicole Hemsoth at The Next Platform.

5 things that will slow your Wi-Fi network

Wi-Fi is quite fickle. The contention between Wi-Fi devices and the dynamic communication medium of the airwaves makes it a sensitive technology with many settings and situations that can slow it down.And even if you aren’t using high-bandwidth devices and applications, faster Wi-Fi is always better.+RELATED: REVIEW: 5 top hardware-based Wi-Fi test tools; 802.11: Wi-Fi standards and speeds explained+To read this article in full, please click here

5 things that will slow your Wi-Fi network

Wi-Fi is quite fickle. The contention between Wi-Fi devices and the dynamic communication medium of the airwaves makes it a sensitive technology with many settings and situations that can slow it down.And even if you aren’t using high-bandwidth devices and applications, faster Wi-Fi is always better.+RELATED: REVIEW: 5 top hardware-based Wi-Fi test tools; 802.11: Wi-Fi standards and speeds explained+To read this article in full, please click here

Automation Isn’t About Building a Button to Press

This is a guest blog post by Carl Buchmann, Managing Solution Consultant at TeraMach. Carl attended the Building Network Automation Solutions online course in 2017.

There is one thing I regret not doing sooner during my automation journey, and that is adopting Git and a proper IDE/text editor that has built-in source control management. I personally use Microsoft Visual Studio Code, as it has Git built in and has many great extensions to validate code syntax.

Read more ...

Understanding IPv6: Link-Local ‘Magic’ (Part 2 of 7)

For those of you new to IPv6, what I am about to show you is going to look a lot like a magic trick. I’m going to bring up an IPv6 IGP neighbor relationship (OSPFv3) between two routers. This doesn’t sound like a magic trick, I know. But what if I told you I am going to do this without putting any IPv6 addresses into the configurations of either routers?

Like any true magician, I must start my magic act with letting you know I have nothing up my sleeves. So let’s review the facts:

  • IPv6 unicast routing is globally enabled on both routers
  • IPv6 OSPFv3 is enabled via the one global command, “ipv6 router ospf 6”
  • Each router has an interface in an out-of-band management network (OOB mgt.) in the subnet 14.14.14.0/24.
  • RouterA is 14.14.14.101 and RouterB is 14.14.14.102 in this OOB management network
  • The IPv4 addresses for the OOB management interfaces are the only IP addresses in the configurations
  • Gig1/0/1 on both routers only has only two IPv6 commands on it, as shown below
  • Router A is monitoring the gig1/0/1 interface and sending the traffic to a Spirent Continue reading

Understanding IPv6: Link-Local ‘Magic’ (Part 2 of 7)

For those of you new to IPv6, what I am about to show you is going to look a lot like a magic trick. I’m going to bring up an IPv6 IGP neighbor relationship (OSPFv3) between two routers. This doesn’t sound like a magic trick, I know. But what if I told you I am going to do this without putting any IPv6 addresses into the configurations of either routers?

Like any true magician, I must start my magic act with letting you know I have nothing up my sleeves. So let’s review the facts:

  • IPv6 unicast routing is globally enabled on both routers
  • IPv6 OSPFv3 is enabled via the one global command, “ipv6 router ospf 6”
  • Each router has an interface in an out-of-band management network (OOB mgt.) in the subnet 14.14.14.0/24.
  • RouterA is 14.14.14.101 and RouterB is 14.14.14.102 in this OOB management network
  • The IPv4 addresses for the OOB management interfaces are the only IP addresses in the configurations
  • Gig1/0/1 on both routers only has only two IPv6 commands on it, as shown below
  • Router A is monitoring the gig1/0/1 interface and sending the traffic to a Spirent Continue reading
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