Cisco OTV Implementation & Troubleshooting (Legacy Multicast mode)
For the details on what Overlay Transport Virtualization (OTV) is and how it works on a high-level, see my previous blog entry about OTV 101. OTV troubleshooting requires a basic understanding of Multicast, as well as ISIS. In-depth troubleshooting on these subjects are not part of the scope of this document. This document will only […]
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The post Cisco OTV Implementation & Troubleshooting (Legacy Multicast mode) appeared first on Packet Pushers Podcast and was written by Ken Matlock.
Show 147 – Avaya Fabric Connect Makes Multicast Simple (Really) – Sponsored
For many network engineers, IP multicast routing is evil. Difficult to design, complicated to implement, painful to troubleshoot and challenging to scale, multicast routing is rarely implemented on a given network unless it’s absolutely required. Most engineers would just rather not bother until the issue is forced upon them. Blame PIM. Blame RPF checks. Blame […]
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The post Show 147 – Avaya Fabric Connect Makes Multicast Simple (Really) – Sponsored appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Cisco OTV 101 (Legacy Multicast Mode): MAC Learning Process Walk
What is OTV? Overlay Transport Virtualization (OTV) is a Cisco-proprietary protocol suite that allows us to extend Layer 2 between datacenters with Layer 3 boundaries in between. It works by encapsulating the L2 packets into L3 multicast packets and sending them out to all other OTV AED’s (Authoritative Edge Devices, used for loop prevention). The […]
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The post Cisco OTV 101 (Legacy Multicast Mode): MAC Learning Process Walk appeared first on Packet Pushers Podcast and was written by Ken Matlock.
Interop: Firewalls, Booth Babes and Unicorn Poop
Now that I’ve returned from the whirlwind that was Interop Las Vegas, I thought I’d share some thoughts about my experience as a speaker and attendee. First the good: The UBM staff was awesome and I appreciated the chance to pontificate on one of my favorite subjects, firewalls. Thanks to some quick thinking by the […]
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The post Interop: Firewalls, Booth Babes and Unicorn Poop appeared first on Packet Pushers Podcast and was written by Mrs. Y.
Identifying Introverted Tendencies
It’s no secret that our industry is full of those with interesting eccentricities. These characteristics are found in varying degrees with those we come into contact with daily. The extremes of these often manifest themselves as a general perception of those in technology. This even happens as technical characters are portrayed television. One example of this […]
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The post Identifying Introverted Tendencies appeared first on Packet Pushers Podcast and was written by Paul Stewart.
Book Review: A Primer of Multicast Routing
I was recently in need of a refresher on multicast routing, so I picked up Eric Rosenberg’s A Primer of Multicast Routing (Springer Briefs in Computer Science). The overall plan of the book is excellent, starting with a basic overview of what multicast is (and does), including why multicast is more efficient than unicast for […]
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The post Book Review: A Primer of Multicast Routing appeared first on Packet Pushers Podcast and was written by Russ White.
How to Turn Your IOS Router Into a Pr0n Server (Pr0n Not Included)
No, really! Did you know that your IOS-based router is capable as acting as a static webserver? Below you will find the steps necessary to turn a GNS/Dynamips box (or any ‘testlab’ machine) into something that can serve basic HTTP/HTTPS content. Due to the security implications of the steps below, it’s not recommended to do […]
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The post How to Turn Your IOS Router Into a Pr0n Server (Pr0n Not Included) appeared first on Packet Pushers Podcast and was written by Ken Matlock.
Show 146 – Arista 7500 – One Switch to Rule Them All – Sponsored
Arista is shipping a serious round of upgrades for the 7500 switch chassis. In this sponsored podcast, Doug Gourlay from Arista returns to the Packet Pushers to give an unvarnished view of the new products and why Arista can deliver 100GbE at a new price point while maintaining technical features and capabilities. Show Topics: 1) It’s […]
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The post Show 146 – Arista 7500 – One Switch to Rule Them All – Sponsored appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Getting the Most Out of SPAN or Mirror Ports
In my previous blog post I looked at the benefits and limitations of SPAN ports. SPAN or mirror ports are a convenient way of getting access to network packets without having to be inline like a firewall. Once you have got your network packet source in place, the next question is, what applications are available […]
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Are You a Fuddy Duddy?
This recent article from IEEE Spectrum discusses our impression that as we age, we lose the ability to learn quickly — fluid intelligence, as it’s called. An accompanying chart shows this in some degree through the skill of chess players across a range of ages. There’s something suspicious about this chart, though, and it’s pairing […]
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The post Are You a Fuddy Duddy? appeared first on Packet Pushers Podcast and was written by Russ White.
Machine Fragile: More Thoughts
I just ran across a pointer to this research on Bruce Schneier’s blog: Networking system components that are well-behaved in separation may create counter-intuitive emergent system behaviors, which are not well-behaved at all. For example, cooperative behavior might unexpectedly break down as the connectivity of interaction partners grows. “Applying this to the global network of […]
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The post Machine Fragile: More Thoughts appeared first on Packet Pushers Podcast and was written by Russ White.
Healthy Paranoia Show 12: The Saga of Terry Childs
Announcing the latest episode of Healthy Paranoia from Mrs. Y featuring the case of Terry Childs, the infamous former Network Administrator arrested for refusing to provide passwords for San Francisco’s FiberWAN system to management. She’s joined by Jeana Pieralde, Chief Security Officer for the City and County of San Francisco, along with two members of the […]
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The post Healthy Paranoia Show 12: The Saga of Terry Childs appeared first on Packet Pushers Podcast and was written by Mrs. Y.
The Technical Mind
I have worked in technology full-time for nearly fifteen years. Prior to this, I built PCs and was somewhat of a technical hobbyist. Occasionally, I am faced with the question, “How does one get into computers?” or “How can I get into computer networking?” There are many paths and correct answers to these questions. The […]
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The post The Technical Mind appeared first on Packet Pushers Podcast and was written by Paul Stewart.
VMware VCDX Lab: The Hardware
I have to admit I’m a big VMware fanboy. Wanting to master the art of virtualization, I’ve set out to build out a personal lab. My primary goal is to work my way up to the VCDX certification. The curious thing about building a VMware lab is that all parts need to be on the […]
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The post VMware VCDX Lab: The Hardware appeared first on Packet Pushers Podcast and was written by Douglas Hanks.
Show 145 – Talking OpenDaylight and SDN
A community show where we get Brent Salisbury and Ivan Pepelnjak to talk about the events of the last few weeks. In the end, the only thing we seemed to cover was OpenDaylight, ONS and various SDN topics. Open Networking Summit – Brent reports in. Talking SDN and OpenDaylight Ivan asks “will you install open […]
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The post Show 145 – Talking OpenDaylight and SDN appeared first on Packet Pushers Podcast and was written by Greg Ferro.
A Data Center Delivers Apps – So Shouldn’t We Monitor App Delivery?
Dinner with His Toadishness, Derick Winkworth, the other night rolled into a 3+ hour discussion of avant garde ways to do networking. One of the adjunct topics that came up was that of ownership within IT. Ownership is a complex problem in the data center, because there’s many complex technologies at work. No one single […]
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The post A Data Center Delivers Apps – So Shouldn’t We Monitor App Delivery? appeared first on Packet Pushers Podcast and was written by Ethan Banks.
Machine Fragile
Yesterday, a “breaking news” tweet at 1:07 PM EDT from the Associated Press reported that two explosions had occurred at the White House and President Obama had been injured. The news immediately sent the Dow Jones Industrial Average down 143 points, as this graph at the London Telegraph shows. There’s also a lovely animated display […]
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The post Machine Fragile appeared first on Packet Pushers Podcast and was written by Russ White.
It Works and It Should Be Better
You say, “It works – don’t fix it.” I hear, “It works – don’t touch it.” I’m also thinking that if you don’t touch it, then it’s never upgraded or changed. Is a static, unchanged network the best you can do to support your business ? Are you happy with just doing more of the same […]
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The post It Works and It Should Be Better appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Your Job Hunt is YOUR Responsibility
Earlier this week, I read the article below. This article took a strong stance that a recruiter works for the employer, not those seeking employment. I think there are some valid points made. However, my views are a little less extreme than that of the author. NEWSFLASH: A Recruiter is Not a Job Finder!. Frankly, […]
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The post Your Job Hunt is YOUR Responsibility appeared first on Packet Pushers Podcast and was written by Paul Stewart.
Programming 101 for Network Engineers – Preparation
Okay, let’s say you’re convinced you need to learn to programme and you don’t want to be left behind. The earlier you start, the more you can pick up (and the sooner you’ll become consciously competent) at a pace that suits you. Hopefully, you’ll be able to blend this into your schedule with whatever else you […]
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The post Programming 101 for Network Engineers – Preparation appeared first on Packet Pushers Podcast and was written by Steven Iveson.