Author Archives: admin

iPerf Network performance comparison between Virtual Machines on ESXi6

I finally found some time to run a series of iPerf network performance tests between Windows server 2008 R2, Windows 2012 and a Linux Debian virtual machines. The tests compare bandwidth throughput between vmxnet3, e1000 going through a 1Gbit and &he...

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Detecting Ephemeral Port Exhaustion in Windows 7 / 8 / 2012

Ephemeral ports are ports that start at a higher range then regular ports. For example when compared to a web server that listens on port 80, ephemeral ports start from 49152 for Windows 2008 R2.  If there are scripts or … Continue reading &r...

Posted in Linux, Networking, Windows | Tagged , , , , , , , | 11 Comments

How to set up a Microsoft Network Load Balancing (NLB) in Windows 2008 R2

OVERVIEW Here is a quick guide how to set up two Web Servers that will be serving out the same web page for redundancy and load balancing purposes.  When we go to www.mywebsite.com address, the name will resolve to the Load Balancing … Cont...

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Manually running sysprep.xml file generated by VMware vCenter

When a user deploys a VM from a template, there is an option to customize the virtual machine by attaching a customization spec to the VM.  What happens in the background is that the virtual machine is cloned from a … Continue reading →...

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SQL Script to create a vCenter 6 database without granting dbo permissions

While installing vCenter 6 I ran into an issue where the following error showed up “The user associated with the DSN has insufficient privileges.  Please provide sufficient privileges for the user by granting the user the following permissio...

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Easy way to create a portable version of the vSphere Client

I recently stumbled on a very easy way to create a portable version of the vSphere client without using Thinapp.  The process extracts the contents of the msi installer that you can copy into a folder and take along with … Continue reading &r...

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Netstat script that runs every 60 seconds and counts open connections

Here is a quick NETSTAT script that runs every 60 seconds and appends the output to c:\ports\netstat.txt.  The script exports the count of connections in a specific state.  The output is very similar to what TcpView shows you at the bottom of &he...

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Adding Realtek R8168 Driver to an ESXi 6.0 ISO

As part of my home lab I installed ESXi 6.0 on one of my older i5 Desktops, the PC has a Realtek 8168 network card built into the motherboard.  I recently tried to upgrade it to ESXi 6.0 but it … Continue reading →...

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Set up and troubleshoot SNMP on an ESXi 5.5 host

Here are some quick notes how to troubleshoot and set up SNMP on an ESXi host. The below also includes how to install snmpwalk and request info from an snmp server. STEPS HOW TO PROPERLY SET UP SNMP ON AN … Continue reading →...

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How to completely disable IPv6 in Windows 7 / 8 / 2012 ::1:

If you are suspecting that IPv6 is causing some issues in your environment you may want to completely disable it to rule it out. When you remove the checkmark for IPv6 from the network adapter this does not completely disable … Continue readin...

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