Enterprises Need to Invoke Plan B As 3G Sunset Looms
The major U.S. carriers all have 3G sunset plans next year. Businesses need to start 3G device replacements now to avoid telemetric data disruptions.Tech Bytes: DDOS and State Exhaustion With NETSCOUT – Updated
Its not widely that DDOS attacks also cause damage from state exhaustion in devices. A recent study why Netscout surprised me that many engineers are aware of overload bandwidth or routing devices but give less considerations to state exhaustion in application aware devices.
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Tech Bytes: DDOS and State Exhaustion With NETSCOUT – Updated
Its not widely that DDOS attacks also cause damage from state exhaustion in devices. A recent study why Netscout surprised me that many engineers are aware of overload bandwidth or routing devices but give less considerations to state exhaustion in application aware devices.Lucky Webapp Inflections
This excellent post contains a workaround. Update the src/models/vrfs.cr file. Summary continue reading
How IT Pros Learn Online In 2021
I surveyed 53 IT professionals about online IT training in August 2021. Most of the folks I interact with are networking & cloud infrastructure professionals, and the answers reflect that. 53 responses isn’t enough to draw hard and fast conclusions from, but I still believe there are interesting trends & individual comments worth thinking about.
By the way, if you’d like to submit your own responses, I left the survey open. I told Google Forms to not collect email addresses, so your responses are anonymous.
1. Which online learning sites do you have a subscription to or have bought an IT course from?
- Udemy – 32
- Pluralsight – 24
- INE – 19
- A Cloud Guru – 16
- CBT Nuggets – 12
- Coursera – 9
- O’Reilly / Safari – 7
- ITProTV – 4
- LinkedIn Learning / Lynda – 3
- Juniper Learning Portal – 2
- Pearson – 2
- Skillshare – 2
- Adrian Cantrill – 1
- Cisco Learning Network – 1
- Global Knowledge – 1
- Ivan Pepelnjak – 1
- KBITS – 1
- Kirk Byers – 1
- Routehub – 1
- Skillsoft – 1
- TalkPython – 1
- Teachable – 1
- YouTube – 1
I believe Udemy is so popular because it’s a great platform to Continue reading
Building Consistent Security for Diverse LAN and Edge Networks
Security needs to be deployed consistently across every edge and tightly coupled with networking so that it can automatically adapt to changes.Hedge 97: Low Context DevOps
Language is deeply contextual—one of my favorite sayings from the theological world is if you take the text out of its context, you are just left with the con. What does context have to do with development and operations, though? Can there be low and high context situations in the daily life of building and running systems? Thomas Limoncelli joins Tom Ammon and Russ White to discuss the idea of low context devops, and the larger issue of context in managing projects and teams, on this episode of the Hedge.
Lucky Webapp Use UUIDs For Primary Keys
By default, new Lucky projects use the Int64 type for primary keys. In this post I will cover the process of changing the Lucky database primary keys type from an Int64 to a UUID. Software Used The following software versions are used in this post. Crystal - 1.1.1 Lucky -...continue reading
MikroTik – RouterOSv7 first look – feedback on routing filters
Overview
Routing filters have been a hot topic lately in the world of RouterOSv7. The first implementation of routing filters in ROSv7 was difficult to work with and documented in the two articles below:
MikroTik – RouterOSv7 first look – Dynamic routing with IPv6 and OSPFv3/BGP
MikroTik RouterOS – v7.0.3 stable (chateau) and status of general release
MikroTik then made some changes and opened up discussion to get feedback. I did a lot of work and testing using ROS 7.1beta7 which never made it to public release and was close to publishing the results when 7.1rc1 came out so this post will use that version.
RouterOSv7.1rc1 syntax example
Here is an example of the latest syntax in ROSv7.1rc1
CLI
### MikroTik RouterOS 7.1rc1 ###
/routing filter rule
add chain=dead.beef.101 rule="if (dst==200:dead:beef:101::/64) {accept}"
add chain=dead.beef.102 rule="if (dst==200:dead:beef:102::/64) {accept}"
add chain=dead.beef.agg rule="if (dst in 200:dead:beef::/48) {accept}"
add chain=bgp-out-v6 rule="if (chain dead.beef.101) {set bgp-local-pref 300; accept}"
add chain=bgp-out-v6 rule="if (chain dead.beef.102) {accept}"
add chain=bgp-out-v6 rule="if (chain dead.beef.agg && dst-len<128) {set bgp-local-pref 150; accept}"Winbox
And the corresponding routes received Continue reading
Introducing logs from the dashboard for Cloudflare Workers
If you’re writing code: what can go wrong, will go wrong.
Many developers know the feeling: “It worked in the local testing suite, it worked in our staging environment, but… it’s broken in production?” Testing can reduce mistakes and debugging can help find them, but logs give us the tools to understand and improve what we are creating.
if (this === undefined) {
console.log("there’s no way… right?") // Narrator: there was.
}
While logging can help you understand when the seemingly impossible is actually possible, it’s something that no developer really wants to set up or maintain on their own. That’s why we’re excited to launch a new addition to the Cloudflare Workers platform: logs and exceptions from the dashboard.
Starting today, you can view and filter the console.log output and exceptions from a Worker… at no additional cost with no configuration needed!
View logs, just a click away
When you view a Worker in the dashboard, you’ll now see a “Logs” tab which you can click on to view a detailed stream of logs and exceptions. Here’s what it looks like in action:
Each log entry contains an event with a list of logs, exceptions, Continue reading
The Next Phase of Cloud-Grade Routing
In the past decade, the emergence of cloud networks has blurred the line between switching and routing versus traditional routers. Today the industry is at an inflection point, where the adoption of cloud principles for routing intersects the rapidly expanding capabilities of the merchant silicon feature set and scale, creating a disruption of legacy routing architectures.
eBPF: When (and when not) to use it
Extended Berkeley Packet Filter (eBPF) is a relatively new feature for Linux kernels that has many DevOps, SREs, and engineers excited. But is it a one-stop shop solution for all of your Linux kernel needs? Let’s take a look at what eBPF does well, and how it stacks up against standard Linux iptables.
What is eBPF?
eBPF is a feature available in Linux kernels that allows you to run a virtual machine inside the kernel. This virtual machine allows you to safely load programs into the kernel, in order to customize its operation. Why is this important?
In the past, making changes to the kernel was difficult: there were APIs you could call to get data, but you couldn’t influence what was inside the kernel or execute code. Instead, you had to submit a patch to the Linux community and wait for it to be approved. With eBPF, you can load a program into the kernel and instruct the kernel to execute your program if, for example, a certain packet is seen or another event occurs.
With eBPF, the kernel and its behavior become highly customizable, instead of being fixed. This can be extremely beneficial, when used Continue reading