In assisting customers with a wide variety of NSX-T related issues, I'm constantly pulling up cheat sheets for frequently used commands. This page organizes my favorite NSX-T ESXi network commands into troubleshooting reference.    
esxcli network nic list
Name    PCI Device    Driver  Admin Status  Link

When vSphere 7.0 with Kubernetes was released earlier this year, it was supported only on a VCF 4.0 Standard Architecture. This required a minimum footprint of 7 ESXi hosts – 4 for the Manage…

Learn how DNS tunneling works and how to configure well-known DNS tunneling attack rootkits to test security and detection capabilities against this threat.
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Launched on the Atari 2600 in 1982, it tasks players with traversing down a continuous vertically-scrolling maze while trying to dodge enemies. Since early game cartridges didn’t have a wealth of memory to store static maze designs, the developer relied…

Nornir script to dynamically populate interface descriptions via CDP Neighbor info - IPvZero/cdp-map

From recent news: "NTT announced that it deployed RPKI-based BGP Origin Validation on its Global IP Network, starting on 25 March, resulting in the rejection of RPKI Invalid BGP route announcements on AS 2914 EBGP sessions. This change positively impacts the internet routing system."

But... how did we get there? What exactly improved? What does NTT deploying RPKI OV mean for other network providers? What does RPKI mean for troubleshooting? What to consider when deploying RPKI OV in your own network?

Through this talk I hope to share experiences from NTT's RPKI OV deployment.

Speaker(s):
Job Snijders, NTT

В выпуске поговорили о мониторинге в целом и чуть меньше о его конкретных реализациях. В два часа не уместились, так

Optics teardown! And this is probably my most exciting one so far! Meet the CFP optic! 100G Ethernet back when it was still hella hard.

What follows is a list of resources that have been recommended to me, and I have found through my own pawing around, if you will. I hope you find this a useful start to your ACI journey!

Theo Julienne is a software & infrastructure engineer.

[Charles] is on a quest to complete ever more jaw-dropping hacks with the popular low-cost ESP8266 WiFi modules. This week’s project is plotting WiFi received signal strength in 3D space. Whi…

Simple (relatively) things allowing you to dig a bit deeper than usual. - gtworek/PSBits

I know that floating-point arithmetic is a bit crazy on modern computers. For example, floating-point numbers are not associative: 0.1+(0.2+0.3) == 0.599999999999999978 (0.1+0.2)+0.3 == 0.600000000000000089 But, at least, this is fairly consistent in my experience. You should simply not assume fancy properties like associativity to work in the real world. Today I stumbled on a … Continue reading GNU GCC on x86 does not round floating-point divisions to the nearest value

Мы решили не давать вам остывать под летними дождями. В июле мы в очередной раз подвергнем сомнению то, как TCP

All high resolution pictures: http://kaizerpowerelectronics.dk/teardown/huawei-rru3908-base-station-teardown-part-1-of-2/

Part 2: https://youtu.be/s3zzL8f67A0

The Huawei RRU3908 is an outdoor Radio Base Station with one to four carriers and one to  six sectors at 20/40 Watt RF output power per carrier.

Up/Downconversion explained: https://youtu.be/qO127zY3voE?t=865
SAW filters explained: https://youtu.be/qO127zY3voE?t=963
Ceramic bandpass filter explained: https://youtu.be/h9-KhfQM3nI?t=729

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