Initial Setup of Catalyst SDWAN Controllers
It’s been a while since I did an on-premises installation of the Catalyst SDWAN controllers and as I recently had […]
Automation, CCIE Automation, Lab
Automation, CCIE Automation, Lab
Installing Step CA in My Homelab
Step CA is an open-source private CA made by Smallstep. I will use it to generate certificates for some componenents
Automation, CCIE Automation, Lab
Installing Dnsmasq in My Homelab
Dnsmasq is an application which has features like DNS caching, DHCP server, and so on. It’s useful as a DNS
Automation, Python
Pinging Hosts Sequentially vs Concurrently in Python
I’m reorganizing some things in my homelab and wanted to check how many hosts are alive in a /24. The
Automation, CCIE Automation, Lab
Installing GitLab Community Edition
I need an on-premises Git server for my labbing so this post will describe how to install GitLab Community Edition
CCIE, CCNA, Certification
Cisco Launches Major Updates to Certifications
Cisco just announced major updates to their certification portfolio. Here’s what’s changing: CCNA v2.0 Effective February 2027, the CCNA is
Automation, CCNP, Certification
Cisco AUTOCOR Passed
Yesterday I took and passed the Cisco AUTOCOR (previously DEVCOR) exam which is the core exam for CCNP Automation. That
BGP
BGP and MTU Deep Dive
A long long time ago, BGP implementations would use a Maximum Segment Size (MSS) of 536 bytes for BGP peerings.
Routing
Understanding Shortest Path First
Link state protocols like OSPF and IS-IS use the Shortest Path First (SPF) algorithm developed by Edsger Dijkstra. Edsger was
Routing
IS-IS Behavior on Multi-Access Networks
In many ways, IS-IS is a simpler, and perhaps more elegant, routing protocol than OSPF. However, it often gets misunderstood.