![]() ![]() Now the difference between Ephemeral and Static is that Ephemeral allows you to assign “new ports” to new virtual nics or virtual machines. With Static all ports are pre-defined on the host level and when a virtual machine is assigned a port it can consume it. Solution Discussion See Also Introduction to Port Scanning While Nmap has grown in functionality over the years, it began as an efficient port scanner, and that remains its core function. Now, from a virtual machine perspective even if vCenter is down, and Static is used as the port bindings, the virtual machine can be powered on and off. This applies to both ephemeral and static however and actually leads to another point, which we won’t discuss now, vCenter resiliency. So the question that this resulted in was should we define a new standard or are the “Static” port binding just as good as Ephemeral? I believe that many people are hesitant of using a pure vDS infrastructure due to the inability to make changes to the vDS when vCenter would be unavailable. This started a discussion internally as the default setting is not Ephemeral but Static. You would not even need to use ephemeral port groups for production virtual networks - simply create a few to have as backups for accessing the most critical VLANs. If the inability to quickly provision a new VM or to reconnect a vNIC while vCenter Server is unavailable has kept you from considering a pure vDS network architecture, ephemeral port groups may be a suitable safety net. ![]() The summary of the article is in my opinion the paragraph I quoted below. The article explains about how Ephemeral ports could be used as a “backup” when vCenter is down. A couple of days ago one of my colleagues released an article about Ephemeral Ports. ![]()
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