OSPF Path Selection Challenge

I had an interesting question come across my desk today which involved a very common area of confusion in OSPF routing logic, and now I’m posing this question to you as a challenge!

The first person to answer correctly will get free attendance to our upcoming CCIE Routing & Switching Lab Cram Session, which runs the week of June 1st 2015, as well as a free copy of the class in download format after it is complete.  The question is as follows:

Given the below topology, where R4 mutually redistributes between EIGRP and OSPF, which path(s) will R1 choose to reach the network 5.5.5.5/32, and why?

Bonus Questions:

  • What will R2′s path selection to 5.5.5.5/32 be, and why?
  • What will R3′s path selection to 5.5.5.5/32 be, and why?
  • Assume R3′s link to R1 is lost.  Does this affect R1′s path selection to 5.5.5.5/32? If so, how?

Tomorrow I’ll be post topology and config files for CSR1000v, VIRL, GNS3, etc. so you can try this out yourself, but first answer the question without seeing the result and see if your expected result matches the actual result!

 

Good luck everyone!

Running Docker Machine on Digital Ocean

Continuing the series on cloud provider examples using Docker machine, up next is Digital Ocean. As with the other posts here is a diagram of how I view Docker Machine usage. For those who don’t have an account already, you can sign get $10 credit with the following link. When you sign up it requires a credit card that won’t ... The post Running Docker Machine on Digital Ocean appeared first on NetworkStatic | Brent Salisbury's Blog.

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iPhone 7 rumor rollup: Your brain on iPhone 7 and plastic survives

Given that Apple sold 61 million iPhones in its most recent quarter and that the iPhone 6 Plus now dominates the U.S. market for phablets with 5.5-inch screens or bigger, you might think Apple could coast for a spell, and that rumors of the iPhone 6S or iPhone 7 would be overkill. But no, the rumor mills cranks along.Your Brain on iPhone 7 Noka Productions Some people are really into the iPhone, and the filmmakers at Noka Productions think the iPhone 7 could literally be into you.To read this article in full or to leave a comment, please click here

Network Break 37

Take a Network Break! Grab a coffee, a doughnut and then join us for an analysis of the latest IT news, vendor moves and new product announcements. We’ll separate the signal from the noise--or at least make some noise of our own. Sponsored by Viptela and Open Networking Summit 2015.

Author information

Greg Ferro

Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count.

He is a host on the Packet Pushers Podcast, blogger at EtherealMind.com and on Twitter @etherealmind and Google Plus.

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The post Network Break 37 appeared first on Packet Pushers Podcast and was written by Greg Ferro.

10 Examples of how to get Docker Container IP Address

One thing that is so much fun about the need virtualization paradigm we are heading towards is that in the age of “software defined”, the flexibility of how to do things with infra are much more like programming then working with highly opinionated traditional infrastructure. Along that thread, here are 10 different ways to get a container or docker-machine address ... The post 10 Examples of how to get Docker Container IP Address appeared first on NetworkStatic | Brent...

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Citizens of Tech 002 – Electric Space Trains

Happy 25th, Hubble. Fold my keyboard. Trains didn't (and don't) suck. Batteries are sexy again. Puking in your VR helmet. FM radio on Deathwatch. These and more stories on Citizens of Tech #2!

Author information

Ethan Banks

Co-host at Packet Pushers

Ethan Banks, CCIE #20655, has been managing networks for higher ed, government, financials and high tech since 1995. Ethan co-hosts the Packet Pushers Podcast, which has seen over 3M downloads and reaches over 10K listeners. With whatever time is left, Ethan writes for fun & profit, studies for certifications, and enjoys science fiction. @ecbanks
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The post Citizens of Tech 002 – Electric Space Trains appeared first on Packet Pushers Podcast and was written by Ethan Banks.

FCC denies requests to delay net neutrality rules

The U.S. Federal Communications Commission has denied the requests of several broadband providers and trade groups asking the agency to delay its net neutrality rules.The FCC, late Friday, denied petitions for a stay of its net neutrality rules from Daniel Berninger, founder of the nonprofit Voice Communication Exchange Committee, the American Cable Association, the National Cable and Telecommunications Association, USTelecom, the Wireless Internet Service Providers Association, AT&T and CenturyLink.To read this article in full or to leave a comment, please click here

Eccentric 21st Century LED lighting with Bluetooth and smartphone apps

You’re sitting in your office (or cube) and it’s kinda drab. You need something to brighten it up and I have just what you might want: Lamps. But these are no ordinary lamps, these are LED lamps called Notti and Dotti produced by Witti Design which you can program from your smartphone and they are kind of eccentric. The Notti is a white truncated prism (100mm high by 75mm wide by 60mm deep) with rechargeable batteries. It can be programmed via an iOS or Android app and connects via Bluetooth BLE. The Notti can continuously change color, change color according to the music being played on your smartphone, stay on a fixed color, gradually brighten in alarm mode to wake you up, or light up when your smartphone receives a message or you get an incoming call. The battery lasts 720+ hours in notification mode (off until a notification event occurs) or 5+ hours in continuous mode.To read this article in full or to leave a comment, please click here

Your Docker Agenda in May

April was quite an eventful month for the Docker Community. By the end of April, over 1,200 people attended the 24 birthday events organized by the Docker community in 11 countries. With the overwhelming number of contributions we received, we … Continued

Some Flickr users facing browser support woes

Some Flickr users are reporting problems with the photo sharing site that may be related to what browser they’re using—even if the browser’s up to date.Since late last month, some users have reported problems after seeing a message telling them their browser was unsupported. Some say they’ve lost the ability to do things on Flickr, like comment on or download photos, while others say their photos now appear in lower resolution.On April 21, Flickr began notifying users they would need the latest browser versions. The service supports Firefox, Chrome, Safari, Internet Explorer and Opera, but its help page now says Flickr may not work properly on older versions of those browsers.To read this article in full or to leave a comment, please click here

The five coolest projects at AT&T Labs

These days, researchers at AT&T Labs are focusing on cars, smart homes, wearables and health apps, judging by projects showcased at the company’s Research Day. This year’s exhibit, held Friday in New York, was more practical than previous ones, with many projects being close to release.Here are five interesting projects shown at the event:Connected carsAs your car gets close to home, the garage door automatically opens and the living room lights and air-conditioning system switch on. Convenient, no? AT&T wants to make that a reality with its Drive initiative, which will track a car’s location, and when it’s within a certain distance of the house, trigger certain pre-configured actions. Alternatively, users could manually issue commands through a console in the car. AT&T already offers smart home and security services, and it’ll be up to car makers to implement this vehicle-based home automation service.To read this article in full or to leave a comment, please click here

The five coolest projects at AT&T Labs

These days, researchers at AT&T Labs are focusing on cars, smart homes, wearables and health apps, judging by projects showcased at the company’s Research Day. This year’s exhibit, held Friday in New York, was more practical than previous ones, with many projects being close to release. Here are five interesting projects shown at the event: Connected cars As your car gets close to home, the garage door automatically opens and the living room lights and air-conditioning system switch on. Convenient, no? AT&T wants to make that a reality with its Drive initiative, which will track a car’s location, and when it’s within a certain distance of the house, trigger certain pre-configured actions. Alternatively, users could manually issue commands through a console in the car. AT&T already offers smart home and security services, and it’ll be up to car makers to implement this vehicle-based home automation service.To read this article in full or to leave a comment, please click here

Show 236 – Talari and the Software-Defined WAN – Sponsored

With more companies jumping on the SD-WAN bandwagon every day, it’s getting harder than ever to figure out how to differentiate solutions. Luckily, Ethan Banks and Greg Ferro help shed some light on what an SD-WAN is, what you should look for and what to be concerned about in this interview with John Dickey, co-founder and CTO at Talari.

Author information

Greg Ferro

Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count.

He is a host on the Packet Pushers Podcast, blogger at EtherealMind.com and on Twitter @etherealmind and Google Plus.

TwitterFacebookGoogle+LinkedIn

The post Show 236 – Talari and the Software-Defined WAN – Sponsored appeared first on Packet Pushers Podcast and was written by Greg Ferro.

Racist stunt gets BBQ joint knocked offline

Edgar Antillon, owner of a Colorado barbecue joint called Rubbin’ Buttz, had a dumb idea that he says started as a “joke:” Let’s declare June 11 “White Appreciation Day,” complete with a 10% discount for white customers. A scribbled sign was posted on the door.And then, since not everyone finds racism funny, some took it out on the Rubbin’ Buttz website. It’s difficult to tell from a small sample size whether Antillon is as racist as his “joke” would indicate or merely a dunderhead without an ounce of common sense. Despite a wave of criticism, the eatery’s Facebook page indicates that he’s sticking to his guns, so the answer may be both.To read this article in full or to leave a comment, please click here

US man pleads no contest to operating revenge porn site

The operator of a so-called revenge porn website has pleaded no contest to criminal charges, including extortion, in a California court.Casey Meyering, operator of WinByState.com, pleaded no contest Friday in Napa County Superior Court to one count of extortion, three counts of attempted extortion, and one count of conspiracy, California Attorney General Kamala Harris announced.WinByState.com encouraged users to post and trade nude photographs of women, including their ex-girlfriends and current girlfriends. WinByState.com asked uploaders to identify their “wins” by city and state, sometimes using the victim’s complete or partial name. At one point, the website claimed to have more than 60,000 members and more than 30,000 pictures posted.To read this article in full or to leave a comment, please click here

The 5 stages of venture capital denial

I attended the recent EMC World, which is one of the best events for press and analysts because it tailors its program for us and our specific needs. There was a nice balance of group sessions and one-on-ones. One of the sessions I found fascinating was given by Scott Darling from EMC Ventures about EMC’s venture funding efforts.Not long ago I attended an event in San Jose where Intel’s investment group leader gave a similar talk, so it was interesting to contrast the two groups. Intel is focused on investing in young companies that consume Intel’s products, EMC is interested in investing in young companies that could grow up to replace all or part of them. These are two very different strategies.To read this article in full or to leave a comment, please click here

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