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Daniel Kuchenski

112 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

SSH with Duo MFA and Active Directory

August 30, 2017 0 Comments duo, mfa, ubuntu, active-directory

Duo has thorough documentation for adding MFA to your SSH sessions, but there are a couple additional steps needed to also integrate with Active Directory. This post will go through the installation for both Duo and Active Directory for Ubuntu 16.04. For other Linux distros, the Duo documentation linked above has you covered.

System components:

  • Ubuntu 16.04 server