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Networking
What happens Same IP Range different subnet mask
I had this question posed to me the other day and it is one of those curiosity questions that you may have asked before or perhaps had a situation that presented itself that gave cause to thinking about this question.…
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Networking
VIRL vs GNS3 vs Packet Tracer which one
Network simulators are a great resources for mocking up certain scenarios, learning, certifications, and plain old “what will happen if I do this in my network” testing. There are are a variety of simulators available out in the wild for…
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ActiveDirectory
Nakivo 6.1 Backup and Restore Active Directory
In enterprise environments today, Microsoft’s Active Directory (AD or ADDS) is by far the most widely used authentication engine that provides identity management as well as access to resources and objects. According to Microsoft’ own statistics, over 90% of businesses…
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VMware
ESXTOP troubleshoot VM network connectivity
ESXTOP is one of the best all around troubleshooting tools in the toolbox of a VMware administrator and it is a built in commandline tool available as soon as you install ESXi. It is an extraordinarily valuable tool to use…
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Networking
Troubleshooting VMware Workstation Network connectivity
Typically, I use VMware Workstation every day running work VMs and performing other testing. I also troubleshoot VMware Workstation for other users as well. From time to time, I have seen issues with VMware Workstation network connectivity either in Bridged…
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Powershell
Reset unresponsive VM with Powershell PowerCLI
I had a recent use case to be able to check the reachability of a certain VM which had shown itself to be problematic. If the VM wasn’t responsive or had crashed, restarting the VM with a graceful restart via VMware…
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SQL
SQL Cluster computer account could not be configured
In working on an older Microsoft SQL Cluster server configuration recently, I ran into an issue with a lab copy of the SQL Cluster not bringing the SQL resources online as expected. After rejoining the domain and sychronizing everything with…
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Powershell
Change Default Gateway with Powershell
One of the best ways to automate or check network settings with modern Windows OS’es is to use Powershell. Recently, I had a really unique use case where the need arose to check the default gateway and flip the gateway from…
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NSX
Troubleshooting NSX VXLAN jumbo frames in nested lab
In working recently in a nested VMware environment running three clusters and NSX, I ran into a jumbo frames issue with VXLAN connectivity across the clusters. I was simulating different WAN/subnet environments using an Untangle appliance as a router in…
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Networking
Configure Dell Nseries switch stack
A quick little how to post on creating a stack between Dell Nseries switches. For the purposes of this post, the stack was created using (2) Dell Nseries 4032F 10G switches. There is just a small amount of configuration that…
