After completing two CCIEs and numerous other certifications over the past 10+ years, I can certainly say that I have been through my fair share of training. As many fellow CCIEs can probably appreciate, learning never stops, not even with two CCIEs, so I continue to go through training from different vendors and OEMs on different products.
Continue reading “Best resources for learning Networking”
NetFlow is an awesome technology that lets you see what type of data is transmitting through your network, in what quantity, and when. It’s supported by a variety of vendors, primarily Cisco, with variants by other vendors such as cFlow, sFlow and jFlow.
Continue reading “Netflow Technology, Free NetFlow Collectors and Nexus 5000 / Nexus 7000”
I had an interesting and relatively tough time with OpenStack. First, the bad news: Due to change in direction/focus, I won’t be spending much time on OpenStack any more. There are still lots of other interesting topics however that have yet to be covered.
Good news: I learned a lot of lessons that may help individuals playing around with OpenStack.
Summary of lessons learned:
Continue reading “OpenStack Adventures”
SDN implementation from any vendor is a big undertaking. Unlike traditional networks, where lifecycle activities individually within network, compute, storage or security teams can happen in fair bit of isolation from each other, SDN implementation requires all teams, especially network, compute, application and security teams, to work more closely with each other than ever before.
Continue reading “Technical and Non-Technical lessons learned from SDN implementation.”
The wonderful world of Software Defined Networking (SDN) is here. If you are a networking professional, it’s best to embrace it with both arms open.
What is SDN? How can I practically get started with SDN? What are some good free and inexpensive resources to learn about all the different SDN solutions? Which SDN solutions should I focus on in particular?
There are no 100% right or wrong answers to these questions, however, I will attempt to answer these questions based on the approach to SDN I am taking myself.
Where and how do you even begin implementing BGP in an established production environment? First of all, I’ve been brainwashed by Ivan Pepelnjak’s blog into using BGP. If you search through his posts relating to BGP, it’s a clear choice (amongst competing protocols like OSPF or IS-IS) for scalability and flexibility for any data center where scalability is a concern.
Continue reading “Multi-DC, Multi-VRF, Multi-Tenant Network Utilizing BGP with L3 DCI”
I am currently in the process of building lab environment to test VMware NSX network virtualization platform. If you are new to NSX or Network Virtualization in general, check out Ivan Pepelnjak’s awesome series on NSX. Definitely check out his other blog posts as well – this is my favorite networking related blog by far.
This will be a living document in which I will document the Wireshark filters that I use most often. For those new to Wireshark, a filter is used to limit the number of displayed packets to help narrow down and more efficiently troubleshoot network issues by looking on only relevant packets.
I will use THIS capture as an example in all filters documented. You can download this packet capture and test the below filters yourself in Wireshark. This capture includes: visiting three websites and SMB (Windows file transfer over network) from one computer to another on the same network.
