Did you ever wonder why a company would replace a working technology with an overhyped pile of half-baked code? Why we at $FAMOUS_COMPANY Switched to $HYPED_TECHNOLOGY by Saagar Jha is a hilarious take on the subject.
Want more? How about migrating your Exadata database to AWS?
Did you ever wonder why a company would replace a working technology with an overhyped pile of half-baked code? Why we at $FAMOUS_COMPANY Switched to $HYPED_TECHNOLOGY by Saagar Jha is a hilarious take on the subject.
Want more? How about migrating your Exadata database to AWS?
In optimization theory, Maximum Flow problems involve finding the maximum flow (or traffic) that can be sent from one place to another, subject to certain constraints. In this post, we will look at Maximum Flow algorithms applied to Networking and the questions they can help answer.
The main focus here will be the applied part, and we will only cover the surface of most algorithms as many of them requires Linear Programming and Optimization theory background.
Assume that we have a small network connecting a few locations in the US using RSVP-TE for traffic management.
RSVP-TE allows us to find paths if there is not enough room on the shortest path, which removes the restriction that the
flows need to travel only on the shortest path.
In the below picture, we can see the Capacity and IGP cost of the links. From a graph representation perspective,
we will use MultiDigraph. Multi to represent multiple links, like between lax<-->iad, and Digraph for capturing the
unidirectional behavior of RSVP LSPs.
We will also assume that we already have some traffic routed between a few locations. The below table shows the existing traffic traveling between locations. For example, we Continue reading
loc
If you’re a fan of the Gestalt IT Rundown that I do every week on the Gestalt IT YouTube channel, you have probably heard about the recent hacks of NVIDIA and Samsung. The original investigation into those hacks talked about using MDM platforms and other vectors to gain access to the information that was obtained by the hacking groups. An interesting tweet popped up on my feed yesterday that helped me reframe the attacks:
It would appear that the group behind these attacks are going after their targets the old fashioned way. With people. For illustration, see XKCD from 2009:
People are always the weakest link in any security situation. They choose to make something insecure through bad policy or by trying to evade the policy. Perhaps they are trying to do harm to the organization or even try to shine a light on Continue reading
If you need any proof that it doesn’t take the most advanced chip manufacturing processes to create an exascale-class supercomputer, you need look no further than the Sunway “OceanLight” system housed at the National Supercomputing Center in Wuxi, China. …
How China Made An Exascale Supercomputer Out Of Old 14 Nanometer Tech was written by Timothy Prickett Morgan at The Next Platform.
In this post, we deploy a multivendor EVPN L2 overlay fabric, with BGP in the underlay as well. The entire fabric deployment is automated with Ansible, and Containerlab is used to define and deploy the actual topology.
I picked up a Dell (Avocent) 2161DS-2 (same as 4161DS?) KVM recently, and needed to use the serial port to upgrade the software.
Naturally, the serial port pinout is non-standard and requires a proprietary cable which comes with the KVM. Dell part numbers 80DH7 and 3JY78 might be involved. I don't have, and have never seen these cables.
I was able to to find the RX, TX and Ground pins and interact with the system using 9600, 8, N, 1.
 |
| Pinout in red text |
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| Is the color coding inside these adaptors standardized? If so this may help. |
The system prints some unsolicited messages ("welcome" or somesuch) a little while after power-up.
Notes from upgrading the firmware from MacOS 12:
# Grab the firmware
URL="https://dl.dell.com/RACK SOLUTIONS/DELL_MULTI-DEVICE_A04_R301142.exe"
wget -P /tmp "$URL"
# Start MacOS tftp service
sudo launchctl load -w /System/Library/LaunchDaemons/tftp.plist
# Extract the firmware (it's a self-extracting exe, but we can open it with unzip)
sudo unzip -d /private/tftpboot "/tmp/$(basename "$URL")" Omega_DELL_1.3.51.0.fl
# Now, using the menu on the KVM serial port, point it toward the MacOS TFTP service
# to retrieve the Omega_DELL_1.3.51.0.fl file
There are people who build big machines and then there are people who create the algorithms, libraries, and applications that harness them. …
Looking For A Singularity Event For Scientific Computing was written by Jeffrey Burt at The Next Platform.
Thank you all for checking out my inaugural post on the Packet Pushers platform. I’ve been a long time fan of the content here and its pretty exciting to be one of the contributors. Sif Baksh recently asked John Capobianco and myself a very interesting question. @John_Capobianco and @Julio_PDX do know of a service where […]
The post External Lab Access With Ngrok and Containerlab appeared first on Packet Pushers.
On today's Heavy Networking, sponsor Itential joins us to discuss how you can deliver a scalable and sustainable network automation system for your enterprise. Our guest is Peter Sprygada, VP of Product Management at Itential.
The post Heavy Networking 621: Get Scalable Network Automation With Itential (Sponsored) appeared first on Packet Pushers.
Serverless computing (marketing term for code running on servers managed by other people) is one of the must-have terms if you’re playing a Buzzword Bingo, but what does it really mean and how does the whole thing work?
Matthias Luft and Florian Barth illustrated the concept during the Introduction to Cloud Computing webinar with a short demo in which they build a simple AWS Lambda function. For a more network-centric view, read the Can We Ping a Lambda Function blog post by Noel Boulene.
Serverless computing (marketing term for code running on servers managed by other people) is one of the must-have terms if you’re playing a Buzzword Bingo, but what does it really mean and how does the whole thing work?
Matthias Luft and Florian Barth illustrated the concept during the Introduction to Cloud Computing webinar with a short demo in which they build a simple AWS Lambda function.
I’ll just assert that there’s no way to use seccomp()
correctly. Just like how there’s no way to use gets()
correctly, causing it to eventually be removed from the C and C++
standards.
seccomp allows you to filter syscalls with a ruleset.
The obvious thing is to filter anything your program isn’t supposed to be doing. If it doesn’t do file IO, don’t let it open files. If it’s not supposed to execute anything, don’t let it do that.
But whether you use a whitelist (e.g. only allow working with already open file descriptors), or a blacklist (e.g. don’t allow it to open these files), it’s fundamentally flawed.
open() in your code actually becomes the openat syscall. Maybe. At
least today. At least on my machine, today.
select() actually becomes pselect6. At least on Fridays.
If you upgrade libc or distribute a binary to other systems, this may start to fail.
Calling printf() will call the syscall newfstatat, a syscall hard
to even parse into words. But only the first time you call it! So
after your first printf() you can block newfstatat.
Maybe Continue reading
There has been a huge uptick in microservices adoption in the data analytics domain, primarily aided by machine learning (ML) and artificial intelligence (AI) projects. Some of the reasons why containers are popular among ML developers is the ease of portability, scalability, and quick access to data using services—specifically network services. The rise of cloud-native applications, especially for big data in the analytics sector, makes these applications a prime target for cyber crime.
Preventing threat actors from breaching the network and accessing critical data or applications is a daunting task for one team or individual to take on alone. DevOps and security engineers, SREs, and platform architects all need to work together to facilitate the process. These teams are usually presented with two challenges:
This article talks about what organizations need to know about zero trust for cloud-native workloads, and how zero trust Continue reading
There is a lot of chatter this week about optical communications with the OFC2022 conference being held in San Diego. …
Talking Silicon Photonics Signal And Noise With Andy Bechtolsheim was written by Timothy Prickett Morgan at The Next Platform.
SRT is a new and modern live video transport protocol. It features many improvements to the incumbent popular video ingest protocol, RTMP, such as lower latency, and better resilience against unpredictable network conditions on the public Internet. SRT supports newer video codecs and makes it easier to use accessibility features such as captions and multiple audio tracks. While RTMP development has been abandoned since at least 2012, SRT development is maintained by an active community of developers.
We don’t see RTMP use going down anytime soon, but we can do something so authors of new broadcasting software, as well as video streaming platforms, can have an alternative.
Starting today, in open beta, you can use Stream Connect as a gateway to translate SRT to RTMP or RTMP to SRT with your existing applications. This way, you can get the last-mile reliability benefits of SRT and can continue to use the RTMP service of your choice. It’s priced at $1 per 1,000 minutes, regardless of video encoding parameters.
You can also use SRT to go live on Stream Live, our end-to-end live streaming service to get HLS and DASH manifest URLs from your SRT input, and do simulcasting to multiple Continue reading