Ghost in the ethernet optic
Ghost in the ethernet optic
A few months ago I stumbled on a tweet pointing out a kind of [SFP optic](https://en.wikiped
How the Internet Really Works Part 2
I’m a little late in posting this, but I thought I’d put it out here anyway. Tomorrow I’m teaching through a three-hour webinar, How the Internet Really Works part 2. From the session description—
This training will provide short reviews of many of these systems and a deeper look at the many tools network engineers can use to discover the information they need to navigate through the DNS and routing systems on the global Internet. This training will be arranged as a set of case studies posing a problem, and then working through tools available to gather the information needed to understand the problem.
SDA and Wireless Part III – understanding AP configurations on the 9800
In this post, we look at the various access point specific configurations that are pushed to a fabric-enabled WLC.
SDA and Wireless Part II – AP onboarding
In this post, we look at how an Access Point is onboarded in a SD-Access fabric.
SDA and Wireless Part I – integrating a 9800-CL WLC into SDA
In this post, we look at how a 9800-CL WLC is integrated into a SD-Access fabric.
Should Your Enterprise Build Its Own 5G Network?
A private 5G network offers multiple benefits. But can the technology benefit your organization?Dutch athletes warned to keep phones and laptops out of China | Reuters
Cybersecurity in sport
Want To Create Content? Consider The Packet Pushers’ Community Blog And Newsletter
If you’ve got “Create Content” as a 2022 goal but aren’t sure how to start, consider the Packet Pushers’ Community blog or our Human Infrastructure newsletter. We welcome articles from folks in networking and IT who have ideas to share or the inclination to write, but don’t have the interest in setting up their own […]
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6 East-West Security Myths Busted
With the world at our fingertips via a simple Google search, it can sometimes be tough to figure out what’s fact and what’s fiction. Whether you’re an expert, novice, or beginner in the tech world, time should be spent putting capabilities and terms into action – rather than trying to piece them together and understand them like a Sudoku puzzle. That’s why we’re going to debunk six major East-West security myths for you – so you can get back to the good stuff.
1. East-West security is the monitoring and inspection of traffic moving medially within the network perimeter, working to identify and block threats and enable access rights.
Busted. East-West security does all of the fancy stuff mentioned, with one very important difference: it moves laterally through the network perimeter. This is a key understanding, since East-West security operates on the premise that threat factors will eventually find a way through next-generation firewalls – which means all internal network traffic is vulnerable.
2. A traditional firewall that manages North-South traffic can handle a modern network breach by itself.
Busted. While it’s important to have North-South security in place (filtering the traffic that is exiting and entering the network), it cannot protect the network on its own Continue reading
Day Two Cloud 129: Practical Advice On Optimizing Cloud Costs
Optimizing cloud costs means more than looking at your bill and hunting down unused instances. It's about understanding the full lifecycle of cloud workloads, dealing with management that wants predictable spending even as your actual usage varies, and setting up repeatable processes. Guests Fred Chagnon and Jeremy Roberts, both at Info-Tech Research Group, offer practical advice for optimizing your cloud spending.
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Day Two Cloud 129: Practical Advice On Optimizing Cloud Costs
Optimizing cloud costs means more than looking at your bill and hunting down unused instances. It's about understanding the full lifecycle of cloud workloads, dealing with management that wants predictable spending even as your actual usage varies, and setting up repeatable processes. Guests Fred Chagnon and Jeremy Roberts, both at Info-Tech Research Group, offer practical advice for optimizing your cloud spending.Catch 2022: Networking Ice Bucket Challenge
At the start of this exciting new year of 2022, I figured this might be a good time to introduce a new challenge:
Using Netsim-Tools, build the most complicated virtual network topology that still allows host A to ping host B
Anything goes — and if you have to extend the tooling to make things work, even better. Varying latency and occasional packet loss are acceptable, but there needs to be at least 1 ping reply being delivered to A.
For example, how about multi-vendor EVPN-VXLAN over SRv6 with MACsec encryption and Traffic Engineering?
Happy 2022 networking everyone! 🎆
Feedback: Recursive BGP Next Hop Resolution
The Recursive BGP Next Hops: an RFC 4271 Quirk blog post generated tons of feedback (thanks a million to everyone writing a comment on my blog or LinkedIn).
Starting with Robert Razsuk who managed to track down the original email that triggered the (maybe dubious) text in RFC 4271:
The text in section 5.1.3 was not really targeting to prohibit load balancing. Keep in mind that it is FIB layer which constructs actual forwarding paths.
The text has been suggested by Tom Petch in discussion about BGP advertising valid paths or even paths it actually installs in the RIB/FIB. The entire section 5.1.3 is about rules when advertising paths by BGP.
Feedback: Recursive BGP Next Hop Resolution
The Recursive BGP Next Hops: an RFC 4271 Quirk blog post generated tons of feedback (thanks a million to everyone writing a comment on my blog or LinkedIn).
Starting with Robert Razsuk who managed to track down the original email that triggered the (maybe dubious) text in RFC 4271:
The text in section 5.1.3 was not really targeting to prohibit load balancing. Keep in mind that it is FIB layer which constructs actual forwarding paths.
The text has been suggested by Tom Petch in discussion about BGP advertising valid paths or even paths it actually installs in the RIB/FIB. The entire section 5.1.3 is about rules when advertising paths by BGP.
Cisco SDA and Security Part IV – micro-segmentation in SDA continued (some more)
In this post, we will look at how to leverage SXP tunnels in ISE to achieve a specific use case.