Tag Archives: networking

Meet Arpy – A BOSH VM Networking Validator

Photo by Hans Eiskonen on Unsplash Ever needed to diagnose weird networking bugs on BOSH deployed VMs? We ran into a problem with a BOSH release that would create routes for itself on the networking stack. To detect this, Arpy was created. How it Works Arpy is a simple bash script which uses the BOSH

Air Gapping: A Moat for the 21st Century

What is Air Gapped? An air gapped environment is one that is not accessible from the internet and cannot access the internet. Enterprises use air gaps in order to prevent access to their network from nefarious external actors and to prevent their own engineers from being able to install any arbitrary software from the internet

Container to Container Networking for Cloud Foundry and Kubernetes

Part Two: Approaching the problem without rewriting existing code Welcome back to the second part of SILK for CFCR. If you just stumbled upon this, it might be a good idea to check out the first blog-post explaining the project. For you TL;DR; kind of people: Here is the ci, here are the wrappers, and

Container to Container Networking for Cloud Foundry and Kubernetes

Part One: Building bridges in the cloud Image Source: https://www.pexels.com/photo/bridge-clouds-nature-outdoors-584315 It started at the CF Summit Basel Hackathon in 2018 and the result is above screencast. What did you just look at? Let’s start with explaining what stack we’re using and what is happening before explaining in depth what we see in the Terminals. The

Fixing bosh-lite packet loss

I recently had the misfortune of having my bosh-lite instance keel over with 80% packet loss (or higher). Turns out, I was suffering from a routing loop. Here’s how to see if you’re suffering from it, too. Disable any routes for 10.244.x.x to If you have configured any routes to send traffic to 10.244.x.x