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Category Archives for "Networking"

Regular Expression for Network Engineer Part-2

This post is continuation of the  Regular Expression for Network Engineer Part-1 , here  we  have a look for the different methods to find out the pattern in string.

Findall() – returns  list of all the  matches the pattern in a string  without overlapping

  • EXAMPLE

[code language = “Python”]

re.findall(pattern, string[, flags])

In [118]: ip
Out[118]: ‘10.10.1.10,29.10.1.10,10.10.1.20,192.168.1.0,172.16.10.1,10.10.10.121’

In [119]: out= re.findall(r'(10.10.10.\d+)’ ,ip)
In [120]: out
Out[120]: [‘10,10.10.1’, ‘10.10.10.121’]

#Above example help us to find out all the IP’s of subnet 10.10.10.0/24 from group of ip’s.

[/code]

Match()-return a match object when pattern is found at the beginning of string, if no pattern is found ,result in None.

  • EXAMPLE

[code language = “Python”]

In [189]: text
Out[189]: ‘Cisco IOS Software, 7200 Software (C7200-SPSERVICESK9-M), Version 12.2(33)SRE, RELEASE SOFTWARE (fc1)’

In [190]: out = re.match(r”Cisco”,text)
In [191]: out
Out[191]: <_sre.SRE_Match object; span=(0, 5), match=’Cisco’>
In [192]: out = re.match(r” Software”,text)
In [193]: out
In [194]: out = re.search(r” Software”,text)
In [195]: out
Out[195]: <_sre.SRE_Match object; span=(9, 18), Continue reading

Regular Expression for Network Engineer Part-2

This post is continuation of the  Regular Expression for Network Engineer Part-1 , here  we  have a look for the different methods to find out the pattern in string. Findall() – returns  list of all the  matches the pattern in a string  without overlapping EXAMPLE   Match()-return a match object when pattern is found at the […]

Automating Cumulus Linux with Ansible

Automating your network can seem like a daunting task. But the truth is that automating Cumulus Linux with Ansible can be easier than many of the things you’re probably already automating.

In this post, I’ll show you how to get started on your network automation journey using a simple, four-step process:

  1. Pick one small network task to automate
  2. Configure it manually on a small scale
  3. Mimic the manual configuration in Ansible
  4. Expand the automation to additional network devices

To illustrate, I’ll be using the following simple, bare-bones topology based on the Cumulus Reference topology. You can follow along by spinning up your own virtual data center for free using Cumulus in the Cloud.

Pick one network task to automate

The first step is to pick one thing to automate. Just one! The only caveat is that it needs to be something you understand and are comfortable with. Trying to automate a feature you’ve never used is sure to scare you away from automation forever, unless of course you have someone guiding you through the process.

Preferably, pick something that’s quick and simple when done manually. Configuring the OSPF routing protocol between two switches falls into this category. When done manually, Continue reading

Dustin’s Internet Community Roadtrip: In the Bay Area, The People Who Make the Internet Ecosystem Thrive

Dustin Phillips, Co-Executive Director of ICANNWiki, is traveling across the United States in his red Toyota Corolla, making connections with the people who are making their communities – and the Internet – a better place. He visited the Bay Area, first making a stop at the Redwood National and State Parks, where he learned about redwood communities and how their survival is dependent on interconnection, a metaphor for the Internet itself.

What is the Internet Ecosystem?

The Internet affects nearly every aspect of society, creating an extremely wide range of stakeholders. There is still a community of stakeholders engaged directly with the Internet’s policymaking processes, but increasingly there are Internet-related discussions occurring at what would traditionally be considered unlikely venues.

CITRIS and the Banatao Institute

Meeting with Dr. Brandie Nonnecke at the University of California, Berkley’s Center for Information Technology Research in the Interest of Society (CITRIS) and the Banatao Institute was a fitting way to kick off my time in the Bay Area. We had a great discussion on the important role of civic participation and collaborative processes for informed decision-making in key issue areas.

Like the incredibly diverse plant life that grows in the understory Continue reading

Configuring SSL for gRPC on Junos

This is a short article on creating a self-signed root certificate which can be used to self-sign certificates for the purposes of treating our telemetry and instrumentation exploration with the security love it deserves. I also cover configuration of mutual SSL for gRPC on Junos. An article of dual purposes!

One of the things I see far too often is clear-text transport being used in demonstrations, labs and even production. This isn’t acceptable. We live in a world where security has to be woven in from the ground up. How do you really know your system works if you leave out all of the security controls?

I hear your teeth grinding. Why do you want to do this? First of all, even though we can bypass security on gRPC with Junos by going for insecure connectivity with clear-text, we shouldn’t. The world we live in is all about the data and the smallest amount of it can give the ‘bad guys’ a lead.

Now we’re done with the why, we need to deal with the how. There are three approaches to PKI that are common:

  1. Run around with your hair on fire rambling nonsense
  2. Create your own Certificate Authority (CA) Continue reading

Datanauts 135: An Introduction To Edge Computing

It turns out you can t do it all in the cloud. And thus, we have the rise of edge computing, in which data is collected, processed, and analyzed close to the source of its creation and close to where people and systems need it.

The goals of edge computing include improving performance, reducing the costs and time of data transmission, and creating new applications to take advantage of that data.

Our guide to edge computing is Alex Marcham. Alex is a technologist, writer and researcher. You can find his work at NetworkArchitecture2020.com.

We level-set with a working definition of edge computing, examine the notion of locality and what it means for edge computing, and discuss latency issues.

We explore edge computing use cases such as industrial processes and video surveillance, and dive into the infrastructure that drives this technology.

Show Links:

Network Architecture 2020

Alex Marcham on Twitter

The post Datanauts 135: An Introduction To Edge Computing appeared first on Packet Pushers.

History Of Networking – Martin Casado – Software Defined Networking

Today, every network vendor sells a solution labeled “software-defined”. But in the 2000’s, the networking stack was driven by constraints in hardware that could not be changed. In this History of Networking, Martin Casado joins us to talk about the ideas that drove his research in software-defined networking and his thoughts on hardware and software in networking.

 

Martin Casado
Guest
Russ White
Host
Jordan Martin
Host
Eyvonne Sharp
Host

Outro Music:
Danger Storm Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/

The post History Of Networking – Martin Casado – Software Defined Networking appeared first on Network Collective.

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