The ramblings of a computer geek
A useful visualisation on your Google Sheets is where you perhaps have a column for “Yes” or “No” or “Done” or “Not Started” and when this cell changes value, the whole row changes colour to make it obvious that action/item has been completed. You can do this as follows: Let’s say you have a spreadsheet … Read more
If like me you struggle to read dark blue comments on a black screen when using VIM, you can set a colour scheme in VIM by creating a file with these contents in your home directory. Add the following: There are a number of other colour schemes to suit your tastes.
The periodic reset of the KRBTGT password is now recommended by Microsoft to be carried out every 180 days. Resetting the password periodically reduces the risks of a Kerbroasting attack being successful. To ensure the KRBTGT password is fully reset you MUST perform this reset operation twice. And you MUST wait a bare minimum of … Read more
Private VLANs provide isolation between ports within a Layer-2 service. Although the configuration is fairly simple, it can become very complex and it also has a number of caveats to how it works and how it can be used. The article explains what Private VLANs are, a brief summary of how they work and then … Read more
The Web Proxy Auto-Discovery (WPAD) Protocol is a method used by clients to locate the URL of a configuration file that provides them with configuration needed to determine their browser’s (or system) web proxy configuration (if present or not). The file an be published via DHCP (scope option) or via DNS, in our case we use DNS. … Read more
Some commands you can use to clean up running containers and your images. Remove any containers, its recommended to verify if they are stopped first with “docker ps -a”: Remove all the images: In my case I had a couple of images that needed to be force removed, you can’t remove images with the above … Read more
Was installing Node.js v25.9.0 as a standalone pre-built binary installation and ended up after a successful installation getting the following when attempting to run a “node -v”. To resolve this, I just needed to install the missing library. Then attempting to re-run the command, I get the version output as expected.
Throughout the whole of the series so far we have talked about IPv4. Although there are some differences when using IPv6, fundamentally you’re doing the same thing, you’re using BGP to advertise and route traffic, its just this time you’re talking about IPv6 routes instead. Now, a key thing to remember is that IPv4 and … Read more
So the first question is what is a BGP Looking Glass? It’s an essentially remote router that you access via a CLI terminal (e.g. Telnet), a web interface or sometimes an API which allows you to see: So why would you want to use a Looking Glass? Put simply, to answer questions such as the … Read more
The Routing Information Base (RIB) is one of the key workings of the BGP protocol on a router. The RIB is not just a routing table, it’s a dynamic repository of all the information that a router has learned from BGP Neighbours, along with a host of associated other attributes, such as the route’s AS … Read more