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November 3, 2008  7:50 PM

How traffic routes between VMs on ESX hosts

Posted by: Eric Siebert
Eric Siebert, Networking, VMware ESX

Understanding virtual machine networking intracacies can be difficult. You might wonder how the network traffic routes between two virtual machines (VMs) that are both located on the same host server -- does the traffic go out onto the network at all? The answer implies that by assigning...

October 2, 2008  4:22 PM

Chosing the best new technologies of VMworld 2008 – Vizioncore vOptimizer Pro and Cisco Nexus 1000v

Posted by: David Davis
David Davis, Virtualization, VMware ESX, VMworld 2008

I had the honor of being a VMworld 2008 judge for the best new products competition. Specifically, I was a judge of the “best new technologies” category. My fellow judge, Mike Laverick ( and I chose...

September 25, 2008  2:17 PM

ESX network configuration automation with esxcfg-vswitch

Posted by: Rick Vanover
Networking, Rick Vanover, VI3, VirtualCenter, VMware ESX

For VI3 environments with multiple VLANs, configuration accuracy is an important step in providing virtual machines with the correct connectivity. Using the esxcfg-vswitch ESX host commands can make life as a VMware admin easier, but there’s a lot to learn. Lucky for you, I have taken the time to...

May 23, 2008  5:09 PM

Adding a remote datastore to VMware Server 2.0 beta

Posted by: Rick Vanover
Networking, Rick Vanover, Storage, Virtualization

I have been evaluating the VMware Server 2.0 beta on Windows and CentOS Linux systems since the release in November of 2007. The second beta of Server 2.0 was released in March, and both versions support adding remote datastores for guest virtual...

January 28, 2008  5:21 PM

VLAN tagging for ESX virtual machines: Making the case

Posted by: Rick Vanover
Networking, Rick Vanover, VI3, VMware ESX

VLAN trunking, or tagging, is a powerful feature that allows ESX virtual machines to connect to multiple networks. However, your network team may not want to enable that. In fact, I have come across many situations where trunking is not done to servers, but only to switches for VLAN availability....

January 3, 2008  7:46 PM

Use disconnected network adapters for build and stage: Save yourself

Posted by: Rick Vanover
Networking, Rick Vanover, VI3, Virtualization, VMware ESX

In VMware ESX, you can configure a guest operating system to have its network adapter disconnected at power on. This is critically important for a phase of a physical to virtual (P2V) migration where the system is migrated yet there are some offline tasks to be done. This can also be during a build...


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