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Category Archives for "Networking"

Nvidia Joins the Fight Against COVID-19

A task force made up of computer scientists at Nvidia has joined the COVID-19 High Performance...

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Cisco Snatches Fluidmesh for On-the-Move IoT Backhaul

The terms of the deal were not disclosed, but Cisco said it expects the acquisition to close before...

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IBM CEO Throws Down Hybrid-Cloud Challenge

That challenge will rely heavily on IBM’s Red Hat business unit, which also received a new leader.

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Unfortunate Natural Experiment Shows the Internet Works

For many weeks now, as the pandemic caused by the coronavirus has spread around the world, people have been isolating themselves to reduce the spread of infection. Businesses and schools have closed, and whole cities have been ordered to stay indoors. People’s livelihoods have disappeared, and of course, far too many people have been critically ill or have died. It is a calamity. Yet it would be much worse, if it were not for the Internet.

It’s enabling life go on. Businesses and schools are able to continue their core activity online. People are able to order food and medicine delivery to lower the risk of contagion. Families are video conferencing to catch up, worship, and even attend weddings. Creators are streaming music and stories from their homes. Clinicians and researchers are sharing crucial medical data worldwide. Everyday citizens, remarkably informed, are trying to flatten the curve.

This is what the Internet is for: a force for good in society.

Resilient by Design

The Internet is working well under this sudden demand because of how it is designed. Nearly magic, the Internet is designed to be a reliable system built of unreliable parts. This might sound awful, as though it Continue reading

How to Easily Secure Virtual Desktops for your Remote Employees

The COVID-19 pandemic has forced many organizations to shift their business online and their employees to work from home. As a result,  business had to quickly adjust and scale up their infrastructure, sometimes with security as an afterthought.

Malicious actors are already taking advantage of this new reality by targeting the vulnerabilities commonly associated with employees connecting to corporate resources from their home environment. This includes social engineering and phishing campaigns, denial of service attacks, and exploiting vulnerabilities in home routers.

Secure VDI Environments with NSX

Providing employees working from home with secure and reliable access to their corporate resources and applications by the use of Virtual Desktop Infrastructure (VDI) helps our customers to reduce the impact on productivity and continuity as well as the risk associated with remote access to internal data.

In this blog post, I will cover a couple of use cases on how NSX can provide security for End User Compute and share some resources to help customers who are scaling up their VDI / remote desktop session host (RDSH) infrastructure to adapt to this new world in which vast numbers of employees are now working from home.

Protect Your Desktop Pools

The initial target of Continue reading

Tech Bytes: Gain Application Fluency Across Multiple Clouds With Oracle SD-WAN (Sponsored)

Today's Tech Bytes podcast tackles SD-WAN with sponsor Oracle. We examine how SD-WAN supports multi-cloud management, fail-safe network automation, more secure connections, and application fluency. Our guest is Doug Tait, Director of Product Marketing.

The post Tech Bytes: Gain Application Fluency Across Multiple Clouds With Oracle SD-WAN (Sponsored) appeared first on Packet Pushers.

The Week in Internet News: Stay-at-Home Orders Highlight Need for Internet Access

More important than ever: With most people in the U.S. and many other countries ordered to stay at home to prevent the spread of the coronavirus, a lack of Internet access in rural and poor areas is making people feel more disconnected than ever, according to an Associated Press story at NWAonline.com. Stella Ashcraft “lives from check to check and can’t afford internet. Her senior-citizen center, where she plays bingo, does puzzles and gets lunch five days a week, is closed. So is her church and the library where she checks email. ‘I feel very withdrawn, isolated, alone,’ she said.

Spotlight on Zoom’s privacy: With many people working from home, web-conferencing app Zoom has become a crucial service for many. However, with the increased use of Zoom is also coming increasing scrutiny. While the company has marketed its service as offering end-to-end encryption, that’s not really the case, The Intercept reports. Zoom Video Communications, the company behind Zoom, has been hit with a class-action lawsuit for allegedly sharing user data with Facebook, CBS News adds. Finally, Zoom has pledged to focus on privacy and security issues, TechXplore reports.

Homework hotspots: As most students in the U.S. and Continue reading

Conntrack tales – one thousand and one flows

Conntrack tales - one thousand and one flows

At Cloudflare we develop new products at a great pace. Their needs often challenge the architectural assumptions we made in the past. For example, years ago we decided to avoid using Linux's "conntrack" - stateful firewall facility. This brought great benefits - it simplified our iptables firewall setup, sped up the system a bit and made the inbound packet path easier to understand.

But eventually our needs changed. One of our new products had a reasonable need for it. But we weren't confident - can we just enable conntrack and move on? How does it actually work? I volunteered to help the team understand the dark corners of the "conntrack" subsystem.

What is conntrack?

"Conntrack" is a part of Linux network stack, specifically part of the firewall subsystem. To put that into perspective: early firewalls were entirely stateless. They could express only basic logic, like: allow SYN packets to port 80 and 443, and block everything else.

The stateless design gave some basic network security, but was quickly deemed insufficient. You see, there are certain things that can't be expressed in a stateless way. The canonical example is assessment of ACK packets - it's impossible to say if an ACK Continue reading

The Never-Ending Story of CLI or API

Over the last weekend I almost got pulled into yet-another CLI-or-automation Twitter spat. The really sad part: I thought we were past that point. After all, I’ve been ranting about that topic for almost seven years… and yet I’m still hearing the same arguments I did in those days.

Just for the giggles I collected a few old blog posts on the topic (not that anyone evangelizing their opinions on Twitter would ever take the time to read them ;).

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Can Fujitsu beat Nvidia in the HPC race?

Arm processors on servers has gone from failed starts (Calxeda) to modest successes (ThunderX2) to real contenders (ThunderX3, Ampere). Now, details have emerged about Japanese IT giant Fujitsu’s Arm processor, which it claims will offer better HPC performance than Nvidia GPUs but at a lower power cost.Fujitsu is developing the A64FX, a 48-core Arm8 derivative specifically engineered for high-performance computing (HPC). Rather than design general-purpose compute cores, Fujitsu has added compute engines specific to artificial intelligence, machine learning, and other technologies specific to the needs of HPC.It will go in a new supercomputer called Fugaku, or Post-K. Post-K is a reference to the K supercomputer, at one time the fastest supercomputer in the world, that ran on custom Sparc chips before RIKEN Lab, where it was installed, pulled the plug.To read this article in full, please click here

AWS VPC Traffic Mirroring Walkthrough

I was recently playing around with the Traffic Mirroring feature in AWS. As a network geek, this is right up my alley because as some colleagues and I used to say, "the wire never lies!". Being able to pick packets off the wire for detailed inspection has saved the day many a time. Until Traffic Mirroring came along, it wasn't possible to do that in an Amazon VPC. Below are my notes and considerations for using this feature.

Ostinato – Drone Mode – Traffic Generator

I have started this below article detailing a small subset of what Ostinato is capable of doing, in short, is a traffic generator with great options to modify and dictate the type of traffic that you want to generate and can do it at decent speeds

https://r2079.wordpress.com/2020/02/26/ostinato-packet-generator-test-your-broadcast-and-mitigation-strategies/

What is the Issue: The issue is that Ostinato in default mode is only supported in GUI mode, which is good for many cases but some times especially if you want to send some decent traffic to stress test your MPLS LSP a PC working from home scenario over VPN is not an ideal bet.

Explain more: Well, imagine you have a Cloud provider Instance, most of the instances are CLI based while Ostinato is GUI based.

So How to Proceed: After seeing what Tool is capable of we purchased the full suite which has Python Api support Plugin as well. So it operates something like this

How does it look:

so you have start the drone first, before doing anything else, i was stuck in this phase for more than 2 hours just because i was dumb not to read all the instructions

You can build the packet and save Continue reading

Safer SSH agent forwarding

ssh-agent is a program to hold in memory the private keys used by SSH for public-key authentication. When the agent is running, ssh forwards to it the signature requests from the server. The agent performs the private key operations and returns the results to ssh. It is useful if you keep your private keys encrypted on disk and you don’t want to type the password at each connection. Keeping the agent secure is critical: someone able to communicate with the agent can authenticate on your behalf on remote servers.

ssh also provides the ability to forward the agent to a remote server. From this remote server, you can authenticate to another server using your local agent, without copying your private key on the intermediate server. As stated in the manual page, this is dangerous!

Agent forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the agent’s UNIX-domain socket) can access the local agent through the forwarded connection. An attacker cannot obtain key material from the agent, however they can perform operations on the keys that enable them to authenticate using the identities loaded into the agent. A safer alternative Continue reading

Headcount: Firings, Hirings, and Retirings — March 2020

Cisco, Hitachi cut hundreds of jobs; Nokia CEO walked the plank; AT&T slashed jobs; plus the...

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CEX (Code EXpress) 10. Creating user functions.

Hello my friend,

So far you have learned the most vital tools to start writing your code in Python such as Python’s variables, lists, dictionary data constructions and code flow control for, while and if. Today you will see how to join them all together to create a user defined functions to make your Python’s code cleaner and less error-prone.

Network automation training – boost your career

Don’t wait to be kicked out of IT business. Join our network automation training to secure your job in future. Come to NetDevOps side.

How does the training differ from this blog post series? Here you get the basics and learn some programming concepts in general, whereas in the training you get comprehensive set of knowledge with the detailed examples how to use Python for the network and IT automation. You need both.

What are we going to do today?

User-defined functions is a reusable parts of the Python’s code, which allow you create some processing once in your code and then call it multiple types anywhere you need. So you will learn:

  • Why it is useful to create user-defined functions
  • How to create the user-defined functions and use them Continue reading
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