Networking

I recently had trouble finding a solution to issue public SSL certs for an OCI Load Balancer with automatic renewal. I was hoping the OCI…

In this post I will be quickly running through the basic setup and configuration of BIRD, an open-source routing protocol daemon for…

Arc.io Earlier today, this site was temporarily enrolled in the Arc.io peer-to-peer Content Delivery Network for testing: As per Arc's site:…

I was recently pulled in to support a migration project, where some H3C firewalls were being swapped out for Cisco ASAs. While the base…

We have a shiny new Segment-Routing MPLS core, and one of the many available features this brings is enhanced Traffic Engineering. Here we…

BGP resets are a common operational tool employed to manipulate exchanged routing tables and to troubleshoot faulty routing operation. Here…

MTR MTR (My Traceroute) is a fantastic diagnostic tool that can outright replace the more common ping and traceroute verification wherever…

So, Cisco have an awesome python script on their github here, and at the time of writing the repo has only 5 stars (yours truly included).…

This post will run through a simple one-off Ansible playbook of mine that I use to install and configure SNMP on newly-provisioned CentOS…

So your shiny new Cisco device now comes with some added toys, such as a fully-fledged built-in Linux environment complete with YUM package…

Rolling out new VLANs across a network can be time consuming. The Ansible playbook documented in this post automates the configuration and…

Hi guys! In this post I am demonstrating the use of Ansible's Jinja2 templating module, and the applications it can be utilized for within a…

This is a quick glimpse at a production application of Ansible to automate your infrastructure Access-Control-Lists. Access-Control-Lists…

This blog post is about SNMPv3. As many Engineers familiar with SNMP will know, SNMP is a powerful protocol that can divulge a lot of…

A few months back I moved away from NGINX and made the switch to Traefik as my SkyeNet.tech reverse proxy. A colleague had recently made the…

Regular expressions, or regex, are templates to match text patterns. They provide a way to describe and parse text, and provide a flexible…

IS-IS is a very powerful Link-State routing protocol that is often overlooked and shied away from. Officially removed from Cisco's CCNP…

Nmap is a highly popular, and very powerful network security tool. Nmap is used for network mapping and port scanning in the discovery of…

VRF, or Virtual Routing and Forwarding, is an IP technology part of Cisco's MPLS/VPN suite used to virtualise logical Routing Tables on a…

In this post, I would like to run through another one of OverTheWire's hacking challenges. To preserve the integrity of the challenges, all…

In this post, I would like to run through another one of OverTheWire's hacking challenges. To preserve the integrity of the challenges, all…

IP addresses consist of 4 bytes of data. Each byte (or octet) can range from a value of 0 to 255, resulting in a total number of…

BGP is a Path-Vector Routing Protocol. Similar to RIP, BGP uses hop-count as it's primary metric for finding the best route, but BGP uses…

A very powerful tool I would like to mention in this entry is Clogin. Clogin, or Cisco-Login, is a part of the RANCID toolkit, or the…

Internet Protocol, originally designed in 1977, is a Layer 3 protocol for packet-switched networks. IP is a connection-oriented…

The story of the Internet begins in the late 1960's, researchers at MIT have just succeeded in transferring data from one computer to…