The ramblings of a computer geek
Tristan Self Although you shouldn’t be working around certificates which are very old or no longer meet modern standards e.g. TLS 1.3 etc. if like me you need to access something using TLS 1, you can use Firefox and change the configuration. Use the URL: about:config Then set: security.tls.version.min (from 2/3 to 1), then attempt to access … Read more
IPerf is a tool that can be used to measure the bandwidth and quality of a network link. Its a useful little tool, so I’ll introduce some of the basics of how you can use it to perform some tests. Bear in mind this is not an exhaustive guide, there are many tweaks that can … Read more
On VOSS/FabricEngine SLPP should be configured on every VLAN at the point where it leaves the fabric and meets a non-fabric loop prevention strategy. This will prevent any loops from impacting the fabric by closing down ports where a loop is detected. The below assumes you already have SLPP configured on your upstream switches. If … Read more
When attempting to deploy a VMWare OVA via vCenter you may see an error such as the following: One possible solution (which might work for you) if you can’t get a suitable replacement OVA is to use the OVFTool (which you can download from VMware) to strip the certificate from the OVA, effectively creating a … Read more
If you need to create an A record that points at a IP in a range that does not belong to you, for example and AWS IP; you need to first create a Network Association so that non-yours IP Address or IP Range can be referred to by a DNS domain we hold the forwards … Read more
The concepts of Traffic Policing and Traffic Shaping can get very detailed, this article intends to be a very high level explanation, I’ve provided some links below that go into more detail. But, first let’s set the scene. When transmitting traffic across a network connection, there are limits, the most notable is the limit in … Read more
Very occasionally my Ohme Pro charger loses its connection to the Nissan LEAF API which it uses to determine the battery status, this doesn’t affect the charging of the car, but just means it reports incorrect information and grumbles to say the “car isn’t charging how we’d expect”, even though it is. Ohme customer car … Read more
Building upon the example Simple Terraform Docker Example (Ubuntu Linux), we’ll store our Terraform State in AWS S3 Bucket, rather than just locally on the machine running Docker. Yes, I know its not a very useful example, but it simply illustrates the mechanism and how it can be used for more useful and complex deployments. Storing … Read more
Attempting to play a multicast stream from Windows VLC Player, was seeing the IGMP Snooping picking up something from my machine, but not the join to the specific group (channel/stream) I was trying to view. I was attempting to get to a stream: udp://@239.4.6.0:1234 Resolution To resolve the problem, it turned out to be VirtualBox, … Read more
The Brocade SAN Switches have SNMP capability which can be used for configuration and monitoring. These instructions detail how to configure SNMP on the SAN switches to allow them to have their state be monitored via SNMP from a suitable monitoring platform (e.g. NagiosXI or Opsview etc.). We are not configuring SNMP Traps, this is … Read more