The best way to learn…

Ever since I was a young man my father always told me:

“The best way for you to learn something is to accept the challenge to teach someone”

Teaching was never on my list of strenghts. I ran away from it the best I could until years ago, where I learned that the above statement was in fact true and I started to lose the fear of public speaking. It is only when you try to teach someone you find out the little details we are still missing.

 

Recently I started a similar challenge, not because I was asked to, but because I offered myself to strengthen the knowledge on both sides, the one who teaches and the one who learns. Its a “win-win situation”. A “customized training” to a small group of employees about the fundamentals of routing and the OSPF protocol up to CCNP level.

So… It’s now time to find out a bit about what I still know and refresh whatever has already run away.

Back to the basics!

Books + Books

And remember:

“Knowledge is nothing unless shared and put into practice”

What is “the Cloud”?

During the first ever Expansão Telecommunications Forum (Expansão is an angolan economics newspaper)I spoke to a few people about hosting services. During our conversation, an angolan service provider employee said:

We have cloud hosting in our data center, why don’t you host your services there?

I knew that provider didn’t really offer cloud services but that started a battle in my mind since while I knew the services from that provider were not really cloud, I couldn’t explain why.

So, what is the cloud? Continue reading

Network Collective #6 – What I Wish I Had Known

I recently came across a podcast called Network Collective which is know into its 6th episode. Of course these days there are millions of podcasts but this one in particular is interesting because it touches on a few points with which I agree.

The topic for this 6th episode was “What I Wish I Had Known” and the conversation is around what guests, with many years of work experience, know now but they wish they would know in the beginning of their careers. Continue reading

CCNA Data Center – My Journey

On April 11th 2017, well on the edge and on the last day before the old CCNA DC exams expiring I finally gog my CCNA Data Center certification, more than a year after starting the studies.

Was it hard? Yes, but no so much for the content.

The idea

My journey started with the decision late 2015, with some experience and after putting my hands on some Cisco Nexus switches I decided to go ahead with certification. Continue reading

Running Cisco UCS Platform Emulator on VirtualBox

My studies of Cisco Data Center technologies have led me to Cisco UCS (Unified Computing Systems). To manage a UCS domain Cisco provides us with the UCS Manager software. This software runs on switch-like devices called Fabric Interconnects acting as the “doorways” between the UCS domain and “the world”.

For all of us studying and needing to understand it without access to a bunch of expensive servers, Cisco was kind enough to create the UCSPE (UCS Platform Emulator) as a free downloadable virtual machine.

Since I’m not a good friend of VMWare and can’t have a bare metal hypervisor, my “playing” focuses mostly on Virtualbox but there is a small detail that must be taken care of:

Summary

Problem: After importing the UCSPE appliance you can’t access the GUI even after changing adapter 1 to Host-only or Bridge. Continue reading

VirtualBox: The Quick Solution to “Extension Pack Installer Failed. VERR_ACCESS_DENIED”

Continuing on with the PC migration saga and getting my new toy working a few days ago I bumped into a problem whose solution I share here. This time, it was with Virtualbox Extension Packs.

Summary

Problem: It was impossible to install Virtualbox Extension Packs. I got the error:“The installer failed with exit code 1: VBoxExtPackHelperApp.exe: error: Failed to rename the temporary directory to the final one: VERR_ACCESS_DENIED Continue reading

Putty Settings Migration

There are few things in this world more frustrating and tiring than having to change PC’s. Throughout my life I started perfecting this “art” in Windows and fortunately today I have programs running that have kept their settings since 5 PC’s ago without a need to reconfigure from scratch.

Putty however, our preferred remote access tool, is a program whose migration I never managed to master. Changing from one PC to another always resulted in having to reconfigure sessions and settings from scratch in a new PC… until today! Continue reading

BGP Large Communities: RFC 8092

Well… seems I have been sleeping for a while. Draft BGP Large Communities about which I wrote a little while ago here already go to it’s final stage about a month ago. RFC 8092 was published mid February/2017.

Looking at the differences between draft 06 (published October/2016) and RFC 8092 little was changed except for small language corrections and the “Reserved Large BGP Community values” section.

Will you be able to play with Cisco routers? Not yet! The “big ones” like Cisco and Juniper have not implemented any draft or the RFC. But if you want to stay updated please keep looking at the implementations page. IXPs (Internet Exchange Point) thatfrequently use servers running opensource routing software can already upgrade their code and start testing and defining policies and community values. This Internet Draft is a good start.

To better understand what this new BGP attribute is, have a look at my post from 2016: Large BGP Communities (Internet Draft).

Follow my blog!

I updated the mail subscription service for the blog. The service I used before, Jetpack, had some issues:

  1. The e-mail is sent immediately. More than once I had an e-mail sent when I didn’t mean to publish
  2. Language. All subscribers get updates in both languages, one e-mail per language. This is annoying for anyone that doesn’t understand one of the languages and even for those who understand both.

For this reason I migrated to Mailchimp, which besides being able to send a single daily e-mail whenever there is a blog update, also allows me to send e-mail to all subscribers whenever there is a need even without publishing a blog post.

All subscribers of the previous service were added to the new service subscribed to both languages. If you want to change the language, click on “actualizar preferências” or “update preferences” in the end of the e-mail.

If you wish to subscribe, fill the form at the right of this page ou in the form at the end of this post and make sure to choose which languages you would like to get e-mails. Continue reading