The ramblings of a computer geek
DNS name resolution is essential to modern connectivity. The ability for hosts to be able to quickly and reliably resolve DNS domain names (e.g. www.google.com) to their IP address equivalents (e.g. 216.58.204.68 or 2a00:1450:4009:827::2004) to connect and consume services ensures consistent and performant network flows. Due to the essential nature of DNS, DNSSEC is an addition … Read more
I was attempting to run a Python script on a Extreme Networks EXOS switch, but it didn’t work. The fix was simple, add the following line to the Python script to import the “exsh” module.
AWS Route53 provides DNS Resolution (and DNS Registrar) services. You can use Route53 to register a domain, host the zone file and provide DNS resolution, alternatively, you can have the domain registered elsewhere, but then use Route53 to host the zone file and provide DNS resolution. There are some different options here, Route53 ties nicely … Read more
Recently Broadcom have moved all VMware customers over to their support portal. Broadcom have a “Site ID” for each customer, so they created one for everyone migrated from VMware. The missing bit was how you get that Site ID, you need this so you can request access to your support and product entitlements. Step 1 … Read more
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