David Varnum

Author Archives: David Varnum

Securing Bitcoins with TREZOR

TREZOR is a hard wallet for securely storing crypto assets such as Bitcoin, Ethereum, and Litecoin. Protection mechanisms like a mnemonic recovery seed, PIN, and encryption passphrase safeguard your assets (private keys) by requiring your physical interaction in order to make transactions. For those crypto noobies, I think it’s easiest to describe the TREZOR functionality […]

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Leveraging SD-WAN for Mergers & Acquisitions

A colleague recently asked me if SD-WAN could be leveraged to expedite network integration as a result of a merger or acquisition. His thoughts were that this could potentially provide a means to securely integration networks in a short amount of time.  At first I thought this made no sense — SD-WAN is not related to this challenge […]

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Issue deploying CSR on ESXi vSphere 6.5

I recently ran into a slight bump when deploying the Cisco Cloud Services Router 1000v (CSR) on ESXi vSphere 6.5.  The error message I received when trying to deploy the CSR OVA was: VALUE_ILLEGAL: Value “VMXNET3 virtio” of ResourceSubType element not found in [E1000, VmxNet2, VmxNet3]. I Googled this message and found nothing. Great, well […]

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OCSA Passed!

It’s official – I passed the ONF Certified SDN Associate exam. I’m OCSA #SDN10356! If you’re interested in obtaining this certificate, I recommend you read through my short blog series covering the resources necessary on the blueprint. ONF Certified SDN Associate (OCSA) – Part 1 ONF Certified SDN Associate (OCSA) – Part 2 ONF Certified […]

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ONF Certified SDN Associate (OCSA) – Part 5

The OCSA exam tests your understanding of components in an SDN framework, your ability to articulate the fundamental workings of networking and the OpenFlow protocol, as well as your knowledge of vendors, solutions and projects available in the SDN landscape. This is the last part in a series of posts that review the blueprint for […]

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