I’ve had to do some work on Citrix NetScaler boxes lately and I’ve discovered a couple of things that are worth elaborating on. NetScalers are very specific about how they use their interfaces and IP addresses and that takes some getting used to. There are also a couple of pitfalls. Continue reading →
I’m happy to bring an update to my previous article about Unetlab. The successor to Unetlab, named EVE-NG, is now released. EVE-NG stands for Emulated Virtual Environment Next Generation and it’s packed with cool new features. I will describe some of them in this article, along with the setup procedure which is very similar to setting up Unetlab. Continue reading →
There’s a bit of unexpected behaviour on ProCurve switches when configuring port mirroring if you come from a Cisco background. Ports that are configured as a destination for port mirroring are still actively participating in their configured broadcast domain(s). I have witnessed the most severe possible consequence in the form of a bridging loop on two core switches. For that reason, I see a warning as due diligence. Continue reading →
I thought I’d do a more generic topic for this post, although some of it is certainly applicable to network engineers as well. When I still did general system administration work I had this list that I used to get a grip on every new infrastructure that I came across. The list consists of a number of topics, most of which are relevant for any given IT infrastructure in existence. I am now sharing this list in the hope that it will be useful for folks starting at a new place or even for junior system administrators who are just getting started. Continue reading →
UNetLab, short for Unified Networking Lab, is a Linux distribution that allows you to build your own networking labs. UNetLab can be seen as a hypervisor for images that are usually run on physical networking equipment or inside separate virtual machines. I wanted to incorporate setting up UNetLab in another article but decided to award the setup process with its own post.