DDoS detection with advanced real-time flow analytics
This article builds on the Docker testbed to demonstrate how advanced flow analytics can be used to separate the two types of traffic and detect the DDoS attack.
docker run --rm -d -e "COLLECTOR=host.docker.internal" -e "SAMPLING=100" \First, start a Host sFlow agent using the pre-built sflow/host-sflow image to generate the sFlow telemetry that would stream from the switches and routers in a production deployment.
--net=host -v /var/run/docker.sock:/var/run/docker.sock:ro \
--name=host-sflow sflow/host-sflow
setFlow('ddos_amplification', {
keys:'ipdestination,udpsourceport',
value: 'frames',
values: ['count:ipsource']
});
setThreshold('ddos_amplification', {
metric:'ddos_amplification',
value: 10000,
byFlow:true,
timeout: 2
});
setEventHandler(function(event) {
var [ipdestination,udpsourceport] = event.flowKey.split(',');
var [sourcecount] = event.values;
Continue reading
Revisiting X.509 Certificates in Kubeconfig Files
In 2018, I wrote an article on examining X.509 certificates embedded in Kubeconfig files. In that article, I showed one way of extracting client certificate data from a Kubeconfig file and looking at the properties of the client certificate data. While there’s nothing technically wrong with that article, since then I’ve found another tool that makes the process a tad easier. In this post, I’ll revisit the topic of examining embedded X.509v3 certificates in Kubeconfig files.
The tool that I’ve found is yq, which is an incredibly useful tool when it comes to parsing YAML (much in the same way that jq is an incredibly useful tool when it comes to parsing JSON). I should probably write some sort of introductory post on yq.
In any case, you can use yq to replace the grep plus awk combo outlined in my earlier article on examining certificate data in Kubeconfig files. Instead, to pull out only the client certificate data, just use this yq command (you did know that Kubeconfig files are YAML, right?):
yq '.users[0].user.client-certificate-data' < ~./kube/config
(Of course, this command assumes your Kubeconfig file is named config in the ~/.kube Continue reading
Introducing new Cloudflare for SaaS documentation
As a SaaS provider, you’re juggling many challenges while building your application, whether it’s custom domain support, protection from attacks, or maintaining an origin server. In 2021, we were proud to announce Cloudflare for SaaS for Everyone, which allows anyone to use Cloudflare to cover those challenges, so they can focus on other aspects of their business. This product has a variety of potential implementations; now, we are excited to announce a new section in our Developer Docs specifically devoted to Cloudflare for SaaS documentation to allow you take full advantage of its product suite.
Cloudflare for SaaS solution
You may remember, from our October 2021 blog post, all the ways that Cloudflare provides solutions for SaaS providers:
- Set up an origin server
- Encrypt your customers’ traffic
- Keep your customers online
- Boost the performance of global customers
- Support custom domains
- Protect against attacks and bots
- Scale for growth
- Provide insights and analytics
However, we received feedback from customers indicating confusion around actually using the capabilities of Cloudflare for SaaS because there are so many features! With the existing documentation, it wasn’t 100% clear how to enhance security and performance, or how to support custom domains. Now, we want Continue reading
How I Migrated from MediaWiki to Notion
I've written before about how I use MediaWiki for taking notes and as one of my study tools. This has worked well for many years. But a problem started to develop: while I wrote my technical notes in MediaWiki, I wrote my day-to-day notes (books I want to read, notes from podcasts I listen to, and even my weekly planner) in Notion. This meant I had to use different apps for reading/writing in each tool, remember two different markup languages, and couldn't (cleanly) link pieces of content between the two. The final straw was realizing how much more effort I had to expend to maintain my MediaWiki instance; I just didn't have the time or will to keep up with new releases not to mention maintain the server itself.
For these reasons, I decided to move all of my MediaWiki content to Notion and unify all of my notes. But this revealed a new problem: there was no tooling to automate this. So I created my own. Here's how it works.
Tech Bytes: Aruba Networks AIOps Get More Features and Functions
Aruba Networks is announcing new capabilities in its Aruba Central platform that leverage machine learning to do things like provide insights into clients on the network, recommend firmware for the best AP performance, and enable natural language queries in languages other than English.Tech Bytes: Aruba Networks AIOps Get More Features and Functions
Aruba Networks is announcing new capabilities in its Aruba Central platform that leverage machine learning to do things like provide insights into clients on the network, recommend firmware for the best AP performance, and enable natural language queries in languages other than English.
The post Tech Bytes: Aruba Networks AIOps Get More Features and Functions appeared first on Packet Pushers.
Datacenter Props Up Nvidia As Gaming Sales Collapse
For the past four years, Nvidia’s datacenter business, which includes GPUs, networking, and servers, has been hot on the heels of its gaming GPU business. …
Datacenter Props Up Nvidia As Gaming Sales Collapse was written by Timothy Prickett Morgan at The Next Platform.
RFC9199: Lessons in Large-scale Service Deployment
While RFC9199 (are we really in the 9000’s?) is targeted at large-scale DNS deployments–specifically root zone operators–so it might seem the average operator won’t find a lot of value here.
This is, however, far from the truth. Every lesson we’ve learned in deploying large-scale DNS root servers applies to any other large-scale user-facing service. Internally deployed DNS recursive servers are an obvious instance, but the lessons here might well apply to a scheduling, banking, or any other multi-user application accessed from a lot of places by a lot of different users. There are some unique points in DNS, such as the relatively slower pace of database synchronization across nodes, but the network-side lessons can still be useful for a lot of applications.
What are those lessons?
First, using anycast dramatically improves performance for these kinds of services. For those who aren’t familiar with the concept, anycase turns an IP address into a service identifier. Any host with a copy (or instance) or a given service advertises the same address, causing the routing table to choose the (topologically) closest instance of the service. If you’re using anycast, traffic destined to your service will automatically be forwarded to the closest server Continue reading
NB393: Arista buys Pluribus, More Supply Chain, Space Networking Slows & DECnet Death
Summer can be slow but there is news!Using AI Chips To Design Better AI Chips
Chip design is as much of an art as it is an engineering feat. …
Using AI Chips To Design Better AI Chips was written by Jeffrey Burt at The Next Platform.
Posts from the Past, August 2022
I thought I might start highlighting some older posts here on the site through a semi-regular “Posts from the Past” series. I’ll start with posts published in the month of August through the years. Here’s hoping you find something that is useful (or perhaps entertaining, at least)!
August 2021
Last year, I had a couple of posts that I think are still relevant today. First, I talked about using Pulumi with Go to create a VPC Peering relationship on AWS. Second, I showed readers how to have Wireguard interfaces start automatically (using launchd) on macOS.
August 2020
I didn’t write too much in August 2020; my wife and I took a big road trip around the US to visit family and such. However, I did publish a post on some behavior changes in version 0.5.5 of the Cluster API tool clusterawsadm.
August 2019
This was a busy month for the blog! In addition to two Technology Short Takes, I also published posts on converting Kubernetes to an HA control plane, reconstructing the kubeadm join command (in the event you didn’t write down the output of kubeadm init), and one introducing Cluster API.
August 2018
Carriers, Vendors Adjust Supply Chain Processes to Aid Broadband Rollouts
Tens of billions in infrastructure funding are being distributed to close the digital divide, but will certain short-term changes result in problems down the road for all parties?Tier 1 Carriers Performance Report: July, 2022
The report offers specific insights into the performance of major Internet Carriers for the month of July, 2022.
The post Tier 1 Carriers Performance Report: July, 2022 appeared first on Noction.
pygnmi 15. Overview of nornir_pygnmi
Hello my friend,
Are you looking for building network automation at scale leveraging the future-proof model-driven network automation? Besides attending our zero-to-hero network automation training and network automation with nornir, we suggest you to take a look at nornir_pygnmi, the new plugin we have created for Nornir to simplify management of network devices with gNMI.
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retrieval system, or transmitted in any form or by any
means, electronic, mechanical or photocopying, recording,
or otherwise, for commercial purposes without the
prior permission of the author.
Is GNMI a Good Interface for Network Automation?
Yes, it is. GNMI is one of the most recent interfaces created for the management plane, which allows you to manage the network devices (i.e., retrieve configuration and operational data, modify configuration) and collect the streaming or event-driven telemetry. Sounds like one-size-fits-all, isn’t it? On top of that, GNMI supports also different transport channels (i.e., encrypted and non-encrypted), which makes it suitable both for lab testing and for production environment. You may feel that we are biased to gNMI, and you are right. Actually, that is a Continue reading