The ramblings of a computer geek
Tristan Self 
The Guess-o-meter (GOM) provides you with an estimate of the range available to you. The GOM updates its estimate (or guess) based on the energy consumption of the current and previous trips. Driving fast and accelerating hard and your GOM will show a lower figure, cold weather so using the heater will also affect this. … Read more
Electric Vehicles utilise different types of charging cable depending on the age, performance and type of EV that you are looking to charge; the article is written from the point of view of charge cables commonly used within the UK, you may find others, but the below is to give you an overview of what … Read more
We’ve recently started to move to an Extreme Networks VOSS Fabric based network, however due to the scale, we can’t change everything attached to it to work more seamlessly with the VOSS fabric based network operation. We have a large number of hosts for example that use Active-Backup bonding on their NICs when connecting to … Read more
Amazon CloudFront is a content delivery network operated by Amazon Web Services. Content delivery networks provide a globally-distributed network of proxy servers to cache content, such as web videos or other bulky media, more locally to consumers, to improve access speed for downloading the content (citation). Although AWS CloudFront can be used as a CDN (caching … Read more
If you are using the AWS Web Application Firewall (WAF) on your Application Load Balancer or other supported AWS entity, you probably don’t want any administrative interfaces of the web application presented directly to the Internet without some form of restriction; perhaps to a range of IPv4 addresses you want to restrict. Adding a rule … Read more
A Web Application Firewall (WAF), is a layer of protection you can add to your web application. Adding a WAF to an Application Load Balancer (ALB) is pretty straightforward. You need to create at least one WebACL, to which you configure some rules (that filter the traffic), you can then attach the WebACL to the … Read more
We’ve started to host websites on AWS, we want to monitor using NagiosXI, but we got some odd results when first attempting to. The web application has no “index.html” page, which is one cause of the 403 forbidden error. However we were getting the same thing even when specifying the correct path. It turns out … Read more
The Microsoft licensing agreements are made based on the number of processor cores (or sockets) that are in use by the physical or virtual hosts that make use of Microsoft software. The Microsoft licensing allows for a VMware ESXi host’s CPUs (or cores) to be licensed instead of the vCPU (virtual CPUs) of each virtual … Read more
Although my website has been running since around 2008, since July 2021 its had over 10,000 visitors in the past nearly 2 years, here’s to 20,000!
The AWS application load balancer is a key infrastructure component for providing access to your application to the Internet, or even for use within your VPC between components. In this example we’ll create a VPC, then within deploy 2 private and 2 public subnets, we’ll then attach an Internet Gateway, a NAT gateway (to allow … Read more