Pushing to Multiple Git Remotes
How to push to multiple git repos across different git providers.Build DSCP to ToS conversion table with Python
Contents
- Introduction
- Problem description.
- Discovery and research phase
- Plan of action
- Writing tests
- Closing thoughts
- References
- GitHub repository with code for this post
Introduction
In this post we're going to write Python program that generates DSCP to ToS conversion table while avoiding hardcoding values as much as possible. We will then save the final table to csv file with pre-defined column headers.
I got the idea for this blog article from the tweet posted the other day by Nick Russo. I thought it is an interesting problem to tackle as similar ones pop up all the time during early stages of Network Automation journey. What makes this challenge great is that it requires us to carry out tasks that apply to writing larger programs.
- We need to understand the problem and possibly do some research.
- We have to come up with plan of action.
- We need to break down larger tasks into smaller pieces.
- We need to implement all Continue reading
The Digital Divide May Be News, But It’s Not New
This opinion piece was originally published in Morning Consult.
Low-income Americans; Black, Hispanic and Native Americans; the elderly; Americans with a high school education or less; and rural Americans are much more likely to be on the wrong side of the digital divide. Ours remains a nation where too many people, often our most vulnerable citizens, are unconnected or under-connected.
The digital divide may have made the news during the COVID-19 pandemic, but it isn’t new.
For much of the past quarter-century, Washington policymakers have ignored the digital divide. In more recent years, some public officials, for political reasons, have identified the digital divide as primarily a rural issue, noting that approximately 5 million rural American households can’t access broadband networks. In reality, the number of rural households that can’t access broadband is dwarfed by the roughly 20 million American households that can’t afford Internet access, and that number almost certainly has increased as a result of the pandemic.
Today, Washington finally seems willing to engage in addressing the digital divide. What we need now are not the patchwork solutions of the past, but a thoughtful, fully funded, comprehensive effort to ensure broadband connectivity for all Americans.
My colleagues and Continue reading
Tech Bytes: UCT’s Global WAN Performance Sparkles With Silver Peak SD-WAN (Sponsored)
Today's Tech Bytes is a conversation with Silver Peak customer UCT about how it adopted SD-WAN to boost performance and minimize the downtime of critical business applications. With 21 sites in 8 countries, the company relies on its WAN to support in-house applications and manage the logistics of its global operations. Our guest is James Mccoll, Network Engineer at UCT.Tech Bytes: UCT’s Global WAN Performance Sparkles With Silver Peak SD-WAN (Sponsored)
Today's Tech Bytes is a conversation with Silver Peak customer UCT about how it adopted SD-WAN to boost performance and minimize the downtime of critical business applications. With 21 sites in 8 countries, the company relies on its WAN to support in-house applications and manage the logistics of its global operations. Our guest is James Mccoll, Network Engineer at UCT.
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Network Break 299: Cisco Acquires Audio Filter BabbleLabs; Apple Update Hits Facebook In The Ads
Today's Network Break shares listener follow-up, then dives into a new Cisco acquisition of an audio company; discusses how Facebook is responding to an Apple update that will hurt a part of Facebook's business; covers financial results from HPE, VMware, and Nutanix; and more tech news.
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Network Break 299: Cisco Acquires Audio Filter BabbleLabs; Apple Update Hits Facebook In The Ads
Today's Network Break shares listener follow-up, then dives into a new Cisco acquisition of an audio company; discusses how Facebook is responding to an Apple update that will hurt a part of Facebook's business; covers financial results from HPE, VMware, and Nutanix; and more tech news.The Week in Internet News: U.S. Moves Closer to Banning Chinese Apps
Shopping for video: As U.S. President Donald Trump pushes for a ban of TikTok unless it’s sold by its Chinese owner, Walmart has joined Microsoft in a bid for the short-video sharing app, CNBC reports. TikTok is reportedly nearing an agreement to sell its U.S., Canadian, Australian, and New Zealand operations for $20 billion to $30 billion.
Boycotting an app ban: Another Chinese app that’s been targeted by Trump is WeChat, but the Chinese foreign ministry has suggested that consumers in the country could boycott Apple if the U.S. takes action against WeChat, The Straits Times says. Apple, as a large U.S. company, seems to be a convenient target for Chinese consumers.
An East/West split: As others have warned, an official with the U.K.’s National Cyber Security Centre has suggested that the Internet may split into a Western version and a Chinese-led Eastern version if Trump moves forward with a ban of Chinese apps, the Independent reports. A split could raise concerns about Western technology keeping up with the East, the official says.
Spy vs. hacker: New Zealand’s government has turned to its intelligence agency to thwart a sustained, multi-day cyberattack on the Continue reading
Century Link/Level 3 Outage is one of the biggest Internet Problem! 3.5% Drop in Global Internet Traffic
On August 30, 2020, Level 3/Century Link, AS 3356 had major Internet outage. In fact this outage effected massive amount of networks, including very well know ones such as Amazon, Microsoft, Twitter, Discord, Reddit etc.
3.5% Global Internet Traffic was dropped due to this outage and entire network converged after almost 7 hours. This is huge amount of time. When we usually discuss convergence, specifically fast convergence, ‘Seconds’ if not ‘ Milliseconds ‘ are the target values.
No one wants to have minutes level network convergence. But when there is an Outage like this, we categorize them as ‘ Catastrophic Failures’ and unfortunately network design usually doesn’t take this kind of failures into an account.
But could it be prevented?
In the first place, let’s understand that, this event, similar to many other catastrophic network events, started at a single location. (According to a CenturyLink status page, the issue originated from CenturyLink’s data center in Mississauga, a city near Ontario, Canada.)
But it spread over entire backbone of AS3356.
In fact, I remember on 2014, which we famously know as 512k incident happened because of this network (Level 3) as well and that event also caused Continue reading
Redundant Server Connectivity in Layer-3-Only Fabrics (Part 2)
In June 2020 I published the first part of Redundant Server Connectivity in Layer-3-Only Fabrics article describing the target design and application-layer requirements.
During the summer I added the details of multi-subnet server and client connectivity and a few conclusions.
Pushing to Multiple Git Remotes
I am working on a project where I need to push to both a github and bitbucket repository as the project is stored in both of these locations. I do not have the ability to sync between the two using either github or bitbuckets built in tools. This post goes through the process of ...Analysis of Today’s CenturyLink/Level(3) Outage
Today CenturyLink/Level(3), a major ISP and Internet bandwidth provider, experienced a significant outage that impacted some of Cloudflare’s customers as well as a significant number of other services and providers across the Internet. While we’re waiting for a post mortem from CenturyLink/Level(3), I wanted to write up the timeline of what we saw, how Cloudflare’s systems routed around the problem, why some of our customers were still impacted in spite of our mitigations, and what appears to be the likely root cause of the issue.
Increase In Errors
At 10:03 UTC our monitoring systems started to observe an increased number of errors reaching our customers’ origin servers. These show up as “522 Errors” and indicate that there is an issue connecting from Cloudflare’s network to wherever our customers’ applications are hosted.
Cloudflare is connected to CenturyLink/Level(3) among a large and diverse set of network providers. When we see an increase in errors from one network provider, our systems automatically attempt to reach customers’ applications across alternative providers. Given the number of providers we have access to, we are generally able to continue to route traffic even when one provider has an issue.
Why I Joined Aviatrix
Earlier this month I joined Aviatrix Systems as a Solutions Architect with a focus on growing the Aviatrix Certified Engineer (ACE) program. I had gone through a journey of 2 years of immersing myself in Public Cloud platforms from training sites, such as A Cloud Guru and Linux Academy. Here are some of my observations … Continue reading Why I Joined AviatrixIn South Asia an Online Training Course Equips Engineers for the Future
The Internet Society, in partnership with South Asia Network Operators Group (SANOG) recently concluded a five-week, hands-on training course for entry level network engineers and system administrators from South Asia. The online course Introduction to Network Operations, which took place from June 15 to July 19, prepared professionals to take advantage of the new opportunities the Internet is creating. The training provided practical learning about UNIX/Linux, networking, and the Domain Name System (DNS) to over 40 participants from Research Education Networks (RENs), government institutions, network operators, universities, and private institutions. SANOG subject matter experts Thilina Pathirana from Sri Lanka and Gazi Zehadul Kabir from Bangladesh moderated via Moodle, an e-learning platform.
Skills and Knowledge for Digital Transformation
The course aimed to prepare young engineers for the future. The technical skills and hands-on knowledge enable them to build expertise to advance professionally in their chosen field of network and system administration. The course also served as a common platform for South Asia community members to actively interact, exchange knowledge, and learn from one another.
For participants, the course was a great learning experience. “It was the best online course I had yet,” said Afaq Ahmed from Pakistan. For young engineers Shreekar Continue reading
Heavy Networking 537: Ansible Vs. Terraform For Network Automation
The networking community seems to have coalesced around Ansible for network device automation and Terraform for cloud. Why this divide? Are the two tools really that different? Today's Heavy Networking explores how and where you can use both these tools, with guests Ned Bellavance and Josh VanDeraa.Heavy Networking 537: Ansible Vs. Terraform For Network Automation
The networking community seems to have coalesced around Ansible for network device automation and Terraform for cloud. Why this divide? Are the two tools really that different? Today's Heavy Networking explores how and where you can use both these tools, with guests Ned Bellavance and Josh VanDeraa.
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Iron Chef: Certification Edition
My friend Joshua Williams (@802DotMe) texted me today with a great quote that I wanted to share with you that made me think about certifications:
You’ve probably already thought through this extensively, and maybe even written about it, but after sitting through another 8 hour practical exam yesterday I’m more convinced than ever that expert level exams from technical companies are more analogous to a gimmicky Food Network TV show than real world application of technical acumen. They don’t care so much about my skill level as they do about what kind of meal I can prepare in 30 minutes using Tialapia, grapes, and Dr. Pepper syrup with my salt shaker taken away halfway through.
I laughed because it’s true. And then I thought about it more and realized he’s way more than right. We know for a fact that companies love to increase the level of challenge in their exams from novice to expert. It’s a way to weed out the people that aren’t committed to learning about something. However, as the questions and tasks get harder it becomes much more difficult to get a good sense of how candidates are going to perform.