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Daniel Kuchenski

113 posts

Optimize Ruckus Configuration - Part 2

February 19, 2018 0 Comments ruckus

A couple years ago I posted how to Optimize Ruckus Configuration, and since then I've been continually tweaking so that my dense, multi-story WiFi environment performs well with Windows, Mac OSX, and mobile devices. Here are my current optimizations:

Note: This is based on Ruckus ZoneDirector build 44

System Wide:

  • Channel Optimization: Optimize for Performance. This

AWS - CloudFormation - Create VPC

January 27, 2018 0 Comments aws, cloudformation

If you have worked with AWS networking, you know there is a laundry list of items that need to be initally configured so the environment is ready for use:

  • VPC
  • Internet Gateway
  • VPN Gateway
  • Public Subnets
  • Private Subnets
  • Public Route Tables
  • Private Route Tables
  • NAT Gateways
  • and more depending on your environment

Since AWS is a software defined cloud datacenter,

Ansible - BadHostKeyException

January 27, 2018 0 Comments ansible, cisco, ssh

When executing an ansible playbook, you may get the following error:

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: paramiko.BadHostKeyException: Host key for server switch-name does not match!

This probably happened after you changed the name of your network device, and generated new RSA keys. Or, if you are using DNS

Pluribus Networks - Whitebox Fabric #NFD16

November 03, 2017 0 Comments nfd16

On day two of Networking Field Day, Pluribus Networks gave us a rundown on what is possible with their Netvisor OS, whitebox hardware, and a distributed architecture. I was impressed with the flexibility of the solution, but like any design choice, there are some limitations to be aware of.

As a relative newcomer to the Pluribus world, I wanted to

Troubleshooting Disk Space Usage

October 16, 2017 0 Comments ubuntu

A couple years ago, my coworker wrote a great post on finding disk space issues in Linux and how to resolve them. Helped me out this weekend when a critical server was having issues, so wanted to post it here:

For future reference (after reading the post above)

Show filesystem usage:

~$ df -h

Show files/

Veriflow - The Formal Future #NFD16

September 19, 2017 0 Comments nfd16

Formal verification. Two words unfamiliar to me before Networking Field Day. To provide a brief summary, formal verification uses mathematical proofs to verify a system is working as designed – the same process used to create hacker-proof code. Veriflow has taken this method and applied it to networking to verify the intended design or operation of the network.

But what does