iTerm2 Tip: Repeating Commands Using a Coprocess

iTerm2 is a great terminal for MacOS; far better than Apple’s built-in Terminal app, and it’s my #1 recommendation for Mac-based network engineers. One of the many reasons I like it is that it has a feature that solves a really annoying problem.

Iterm Repeat Title

It’s tedious having to issue a command repeatedly so that you can see when and if the output changes. I’ve had to do this in the past, repeating commands like show ip arp so that I can spot when an entry times out and when it it refreshes. The repeated sequence of up arrow, Enter, up arrow, Enter, up arrow, Enter drives me mad.

Some vendors offer assistance; A10 Networks for example has a repeat command in the CLI specifically to help with show commands:

a10-vMaster[2/2]#repeat 5 show arp
Total arp entries: 25       Age time: 300 secs
IP Address         MAC Address          Type         Age   Interface    Vlan
---------------------------------------------------------------------------
10.1.1.65      0000.5e00.01a1       Dynamic      17    Management   1
10.1.1.67      ac4b.c821.57d1       Dynamic      255   Management   1
10.1.1.97      001f.a0f8.d901       Dynamic      22    Management   1
Refreshing command every 5 seconds. (press ^C to quit) Elapsed Time: 00:00:00
Total arp entries: 25       Age time:  Continue reading

Worth Reading: The Importance of Setting Goals

As Tom Garriga, president of Tang Wei Martial Arts Institute, tells us, “A goal is an enemy to be conquered with a battle strategy and the commitment of a warrior. The leadership process is founded on resolve and commitment.” With this in mind, there are several components to the proper setting of goals that every leader should embody. —Chris Brady

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Register for DockerCon Europe 2017 Livestream

For those of you who can’t make it to DockerCon Europe 2017 in Copenhagen, we are thrilled to announce that the General Sessions on both Day 1 and Day 2 of DockerCon will be livestreamed!

Find out about the latest Docker announcements live from Steve Singh (CEO) and Solomon Hykes (Founder and CTO) and enjoy the highly technical demos the Docker team has prepared for you!

Livestream schedule:

  • General Session Day 1 on 10/17 from 9am UTC +2
  • General Session Day 2 on 10/18 from 9am UTC+2

DockerCon Livestream

The livestream player will be embedded on the DockerCon site a few hours prior to the event. Be sure to sign up here to receive an email with the link to the livestream before the general session starts!

Sign up for the DockerCon EU Livestream

 

We invite you to follow the official Twitter account: @DockerCon and hashtag #DockerCon in order to get the latest updates.

Learn More about DockerCon

Watch the live stream of keynotes at #DockerCon Europe | Oct 17 – 18, 9-11am UTC +2
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Update: Brocade Data Center Switches

Second vendor in this year’s series of data center switching updates: Brocade.

Not much has happened on this front since last year’s update. There was a maintenance release of Brocade NOS, they launched SLX series of switches, but those are so new that the software documentation didn’t have time to make it to the usual place (document library for individual switch models), it's here.

In any case, the updated videos (including edited 2016 content which describes IP Fabric in great details) are online. You can access them if you bought the webinar recording in the past or if you have an active ipSpace.net subscription.

Performance Implications of CNAME Chains vs Oracle ALIAS Record

The CNAME resource record was defined in RFC 1035 as “the canonical name for an alias.” It plays the role of a pointer, for example, the CNAME informs the requestor that www.containercult.com is really this other name, instance001.couldbalancer.example.com.

The CNAME record provides a “configure once” point of integration for third party platforms and services. A CNAME is often used as opposed to an A/AAAA record for the same reason developers often use variables in their code as opposed to hard coded values. The CNAME can easily be redefined by the third party or service provider without requiring the end user to make any changes.

A stipulation that prevents use of the CNAME at the apex is that no other records can exist at or alongside a CNAME. This specification is what prevents an end user from being able to place a CNAME at the apex of their zone due to the other records, which must be defined at the apex such as the Start of Authority (SOA).

ALIAS / ANAME – The way of the future 

The Oracle ALIAS record allows for CNAME-like functionality at the apex of a zone. The Oracle implementation of the Continue reading

Microwave or Fiber which one is faster ?

Microwave or Fiber which one is faster ? I will explain  the faster connectivity option and some of the use cases for each, deployment considerations a bit in this post. Why latency is important for some special businesses  ? Have you heard about HFT (High Frequency Trading) ? If you like the discussion points, after […]

The post Microwave or Fiber which one is faster ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

Study: Use of IoT in corporate networks is soaring

We’ve reached the sharp part of the adoption curve for IoT, as a recent study shows skyrocketing adoption of the technology across all business sectors for a huge range of different purposes.Vodafone’s annual IoT barometer this month found that 84% of the 1,278 senior IT decision-makers who responded had increased their adoption and use of IoT solutions in the past year. 12% of the respondents had at least 10,000 connected devices in use at their company, while 6% had more than 50,000 in operation.+ALSO ON NETWORK WORLD: Forrester: 3 ways IoT can drive business value + FAQ: What is NB-IoT?To read this article in full or to leave a comment, please click here

IDG Contributor Network: How smart cities can protect against IoT security threats

Smart cities, which were once confined to the realms of science fiction books, are rapidly becoming a reality all around the globe. Unfortunately, like all revolutionizing innovations, smart cities are developing their own unique challenges alongside of their perks. So what are industry insiders and tomorrow’s city planners doing to face these challenges?The security issues facing smart cities are unlike anything ever before seen, and solutions to these problems haven’t yet sprung up en masse, meaning many different interest groups have proposed their own respective plans. By combing through some of today’s proposed solutions, we can identify some of the leading trends that will come to dominate the future of smart city security.To read this article in full or to leave a comment, please click here

IDG Contributor Network: How smart cities can protect against IoT security threats

Smart cities, which were once confined to the realms of science fiction books, are rapidly becoming a reality all around the globe. Unfortunately, like all revolutionizing innovations, smart cities are developing their own unique challenges alongside of their perks. So what are industry insiders and tomorrow’s city planners doing to face these challenges?The security issues facing smart cities are unlike anything ever before seen, and solutions to these problems haven’t yet sprung up en masse, meaning many different interest groups have proposed their own respective plans. By combing through some of today’s proposed solutions, we can identify some of the leading trends that will come to dominate the future of smart city security.To read this article in full or to leave a comment, please click here

BrandPost: Network-as-a-Service, Not a Barrier

Enterprises are getting hooked on “everything-as-a-service” and the revolution that ripped through the data center is rapidly encompassing network infrastructure. As more and more IT assets rely on cloud computing, IT decision makers need to make sure their networks aren’t becoming obstacles to achieving business objectives.According to the State of the CIO Survey 2017, “IT investments are being directed toward business initiatives such as improving customer experience (40%), transforming existing business processes (40%), increasing operational efficiency (35%), and growing the business (33%).”To read this article in full or to leave a comment, please click here

SDN: Is Here to Stay

In an October 3, 2017 article published in Network Computing, titled: “SDN: Time to Move On,” Gartner Analysts report on the state of software-defined networking and advise enterprises to shift their focus. It has triggered some interesting conversation in the SDN field. As a leading player of SDN technology, we have received several inquiries for comments on the article. While the controversial title grabbed a lot of attention, it’s alarming to many and far from reality. More importantly, it differs from what Gartner reports have concluded.

From what we see in the market, SDN has already landed real use cases and built the momentum to change the production network. However, as Gartner expressed in the reports, we have seen two gaps in adopting SDN: It takes a long time for customers to adopt this nascent technology; and while SDN can be used to solve many imminent issues, it is not a panacea to all networking problems.

image-profit_imageshutterstockAccording to Gartner, “SDN started as a new technical architecture, but brought into light some valuable concepts that outlived the original blueprint,” Gartner VP Distinguished Analyst, Joe Skorupa and Research Director, Danilo Ciscato wrote. The article also reveals, “The story’s different in Continue reading

SDN: Is Here to Stay

In an October 3, 2017 article published in Network Computing, titled: “SDN: Time to Move On,” Gartner Analysts report on the state of software-defined networking and advise enterprises to shift their focus. It has triggered some interesting conversation in the SDN field. As a leading player of SDN technology, we have received several inquiries for comments on the article. While the controversial title grabbed a lot of attention, it’s alarming to many and far from reality. More importantly, it differs from what Gartner reports have concluded.

From what we see in the market, SDN has already landed real use cases and built the momentum to change the production network. However, as Gartner expressed in the reports, we have seen two gaps in adopting SDN: It takes a long time for customers to adopt this nascent technology; and while SDN can be used to solve many imminent issues, it is not a panacea to all networking problems.

image-profit_imageshutterstockAccording to Gartner, “SDN started as a new technical architecture, but brought into light some valuable concepts that outlived the original blueprint,” Gartner VP Distinguished Analyst, Joe Skorupa and Research Director, Danilo Ciscato wrote. The article also reveals, “The story’s different in Continue reading

Choosing your chassis: a look at different models

Simplicity, scalability, efficiency, flexibility — who doesn’t want to be able to use those words when talking about their data center? As more and more companies adopt web-scale networking and watch their growth rapidly increase, the need for an equally scalable and powerful solution becomes apparent. Fortunately, Cumulus Networks has a solution. We believe in listening to what our customers want and providing them with what they need; that’s why we supports the Facebook Backpack for 64 to 128 ports of 100gig connectivity and the Edge-Core OMP800 for 256 ports of 100gig connectivity. So, what exactly is so great about these chassis? Let’s take a closer, more technical look.

The topology

When designing and building out new data centers, customers have universally agreed on spine and leaf networks as the way to go. Easy scale out by adding more leafs when server racks are added and more manageable oversubscription by adding more spines makes this design an obvious choice. We at Cumulus have built some of the largest data centers in the world out of one-rack-unit switches: 48 port leafs and 32 port spines. These web-scale data centers build “three-tier” spine and leaf networks using spine and leaf “pods” Continue reading

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