The ramblings of a computer geek
Multicast is a networking method used to efficiently transmit data to multiple recipients simultaneously. Unlike unicast (one-to-one) and broadcast (one-to-all) communication, multicast is a one-to-many or many-to-many method where data is sent only to devices that are interested in receiving it, rather than to all devices on a network. In multicast, devices that want to […]
More...You can install VMware PowerCLI via either the online installer, i.e direct into PowerShell, or via an offline installer. The offline installer instructions can be found here. For online installation, you can perform the following steps: Step 1 – Open PowerShell, you may need to “Run as Administrator”. Step 2 – Install all PowerCLI modules […]
More...VMware HA (High Availability) is a great feature, but if the failure occurs when you are not watching it you may well need to know what was affected. You can use VMware PowerCLI to query vCenter for the VMs that have been affected by a host failure causing an HA restart event. I’m assuming that […]
More...Sometimes you have some kit that is just old and isn’t supporting the recent (and secure) key algorithms, if you need to connect (with some consideration of the security implications) you can use something like the below. The “-v” means verbose, you can see when connecting what the end point is offering, then you can […]
More...I had a need to be able to show up a row if a date in that row had fallen out of compliance, e.g. list of assets, with a “Last Patch” date on it. If the “Last Patch” date is more than X days (e.g. 90 days) before today, then show it up. At the […]
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The AWS Transit Gateway can be used to join the networking of many VPCs (in the same or different AWS Accounts) within the same region together to facilitate communication, it may also be used in conjunction with DX (Direct Connect) or Site-to-Site VPNs to provide connectivity to other Cloud Platforms but additionally to on-premise networks […]
More...An appliance that was deployed over 90 days old with no changes made to the default settings. When attempting to logon to the VAMI console of the appliance i.e. https://vcenter.domain.com:5480 you get the message: “Exception in invoking authentication handler User password expired”. To resolve this you need to reset the password, then set it not […]
More...I always find this a bit of a confusing one, just running a “no lacp key” doesn’t work, what you actually need to do is set it to “default”. So for example let’s say you have a LACP key assigned to interface 1/13 which you want to remove, its as simple as running the following […]
More...We had an issue where our RODCs suddenly stopped authenticating users and also would not allow administrators to logon via RDP or locally via the console giving this message: “there are currently no logon servers available to service the logon request” Any downstream services that were trying to authenticate via LDAP or LDAPS also failed […]
More...You want to search your Microsoft Exchange message tracking logs to track an email, you can do this using a Powershell command (run from the Microsoft Exchange Powershell console), the below command will query all your Microsoft Exchange servers to find the tracking logs and then obtain all emails sent by the user “sender@domain.com” between […]
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