The ramblings of a computer geek
Tristan Self We had a request to enable AVX2 on a virtual machine. AVX2 are virtualisation extensions, essentially its providing processor instructions through from the physical CPU that are for optimizing virtualisation. In simple terms allow a virtual machine to be able to run virtualised workloads. You would need to enable this setting if you wanted to … Read more
When attempting to copy (clone) a VMDK, we were experiencing the issue that a copy of a VMDK would get to about 100% then fail. Performing via the Web UI or via the CLI (from a host directly) would give the same issue. We attempted this on another VM and it worked fine, it turned … Read more
Emails are made up of a header and body, the body may be HTML or plain text, and any attachments are encoded within the body of the email for it to be sent. We have applied limits to our email infrastructure to reduce load, bandwidth, and disk space but also to protect recipients of our … Read more
If you need to perform a Ping scan of a subnet, you can use the following command, its quick and dirty approach, although its not really that quick when it comes to actually running. The below will scan the subnet 192.168.1.0/24, from 192.168.1.1 to 192.168.1.254. If you want to speed things up a bit, you … Read more
The lowly Format command provides some simple, yet fairly effective data destruction for hard disks that you have on your machine. Although this technique may not be suitably effective for all data destruction requirements, it is fairly thorough in the destruction of data on a disk; such as one you wish to reuse for another … Read more
NagiosXI has a multitude of ways of monitoring hosts or services. Typically with a Microsoft Windows or Linux host you can monitor using SNMP, but you may also now want to check out the NCPA agent as a way to monitor from NagiosXI. Newer versions of NagiosXI also give the ability to administer, update and … Read more
Time spent in meetings is time spent not working on tasks. Meetings however are essential, but also must be structured and conducted in a way to ensure they are not wasting valuable time. A way of ensuring this is a robust “meeting etiquette”, i.e. rules of engagement to ensure that your time is not unduly … Read more
If you want to verify what your SSH server is providing to clients as options of supported algorithms you can use the following command: It makes use of an NMAP script “ssh2-enum-algos.nse” to enumerate the list of algorithms that the SSH server supports. Useful if you are having issues with clients connecting using supported methods, … Read more
There are graphical tools to test and use the Dell ECS S3 interface, but everyone wants a CLI right? The below should also work for AWS S3 (with some modification) but this documentation is intended for specific use with the Dell ECS S3 endpoint to verify behaviour and perform some performance testing. The below assumes … Read more
Allow a connection from a particular remote IP address to any IP address on the local machine on a specific port (TCP & UDP). Verify with: