<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/" version="2.0">
  <channel>
    <title>topic Re: Static MAC address not starting with 00:50:56? in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932652#M79840</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi.. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Both are actually automatically generated... 00:00c:29 is generated by the ESXi host itself when not joined to a vCenter instance. 00:50:56 is generated by vCenter if the ESXi host is joined to such.&lt;/P&gt;&lt;BLOCKQUOTE&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style="font-size: 10pt; line-height: 1.5em;"&gt;But can I reuse the automatically generated MAC address which starts with 00:0c:29 (and of course make sure ESXi won't use the same MAC address for another VM)?&lt;/SPAN&gt;&lt;SPAN style="font-size: 10pt; line-height: 1.5em;"&gt; &lt;/SPAN&gt;&lt;/P&gt;
&lt;/BLOCKQUOTE&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; Yes.. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;/Rubeck&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Thu, 20 Nov 2014 08:05:11 GMT</pubDate>
    <dc:creator>Rubeck</dc:creator>
    <dc:date>2014-11-20T08:05:11Z</dc:date>
    <item>
      <title>Static MAC address not starting with 00:50:56?</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932650#M79838</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I have a quick question before I go to bed (so I have no time for some test).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I have just found this article about static MAC address: &lt;A href="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;amp;cmd=displayKC&amp;amp;externalId=219" title="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;amp;cmd=displayKC&amp;amp;externalId=219"&gt;VMware KB: Setting a static MAC address for a virtual NIC &lt;/A&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;The article said that "VMware uses a different OUI for manually generated addresses: 00:50:56."&amp;nbsp; But can I reuse the automatically generated MAC address which starts with 00:0c:29 (and of course make sure ESXi won't use the same MAC address for another VM)?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thanks&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 19 Nov 2014 19:28:30 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932650#M79838</guid>
      <dc:creator>Horinius</dc:creator>
      <dc:date>2014-11-19T19:28:30Z</dc:date>
    </item>
    <item>
      <title>Re: Static MAC address not starting with 00:50:56?</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932651#M79839</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hey,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;this KB is only valid until ESX 2.5&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Is this really the version you are using?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;The valid guide for ESXi 5.5 can be found here: &lt;A href="http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-552-networking-guide.pdf" title="http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-552-networking-guide.pdf"&gt;http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-552-networking-guide.pdf&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 19 Nov 2014 20:31:53 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932651#M79839</guid>
      <dc:creator>schepp</dc:creator>
      <dc:date>2014-11-19T20:31:53Z</dc:date>
    </item>
    <item>
      <title>Re: Static MAC address not starting with 00:50:56?</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932652#M79840</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi.. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Both are actually automatically generated... 00:00c:29 is generated by the ESXi host itself when not joined to a vCenter instance. 00:50:56 is generated by vCenter if the ESXi host is joined to such.&lt;/P&gt;&lt;BLOCKQUOTE&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;&lt;SPAN style="font-size: 10pt; line-height: 1.5em;"&gt;But can I reuse the automatically generated MAC address which starts with 00:0c:29 (and of course make sure ESXi won't use the same MAC address for another VM)?&lt;/SPAN&gt;&lt;SPAN style="font-size: 10pt; line-height: 1.5em;"&gt; &lt;/SPAN&gt;&lt;/P&gt;
&lt;/BLOCKQUOTE&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; Yes.. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;/Rubeck&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 20 Nov 2014 08:05:11 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932652#M79840</guid>
      <dc:creator>Rubeck</dc:creator>
      <dc:date>2014-11-20T08:05:11Z</dc:date>
    </item>
    <item>
      <title>Re: Static MAC address not starting with 00:50:56?</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932653#M79841</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;the KB you have posted is quite obsolete ... but I will try to depict some facts:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;- When you are creating VMs through vCenter autogenerated MAC address for the VM is based on vCenter ID. ... respectively last three octets are based on vCenter unique ID.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;- When you are creating VMs through ESXi host :&lt;/P&gt;&lt;P&gt;&lt;EM&gt;The host generates MAC addresses that consists of the VMware OUI 00:0C:29 and the last three octets in hexadecimal format of the virtual machine UUID.&lt;/EM&gt;&lt;/P&gt;&lt;P&gt;&lt;EM&gt;The virtual machine UUID is based on a hash calculated by using the UUID of the ESXi physical machine and the path to the configuration file (.vmx) of the virtual machine. &lt;/EM&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;EM&gt;&lt;STRONG&gt;Preventing MAC Address Conflicts&lt;/STRONG&gt;&lt;/EM&gt;&lt;/P&gt;&lt;P&gt;&lt;EM&gt;All MAC addresses that have been assigned to network adapters of running and suspended virtual machines on a given physical machine are tracked for conflicts. &lt;/EM&gt;&lt;/P&gt;&lt;P&gt;&lt;EM&gt;If you import a virtual machine with a host-generated MAC address from one vCenter Server to another, select the I Copied It option when you power on the virtual&lt;/EM&gt;&lt;/P&gt;&lt;P&gt;&lt;EM&gt;machine to regenerate the address and avoid potential conflicts in the target vCenter Server or between the vCenter Server systems.&lt;/EM&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="text-decoration: underline;"&gt;In addition to your questions ... below is a list of all registered OUIs in IEEE by VMware, Inc. :&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;1) &lt;STRONG&gt;00:50:56&lt;/STRONG&gt; - auto generated MAC by vCenter server&lt;/P&gt;&lt;P&gt;2) &lt;STRONG&gt;00:05:69&lt;/STRONG&gt; - probably auto-generated MAC on legacy ESX hosts&lt;/P&gt;&lt;P&gt;3) &lt;STRONG&gt;00:0C:29&lt;/STRONG&gt; - auto generated MAC on ESXi hosts and products like VMware Workstation&lt;/P&gt;&lt;P&gt;4) &lt;STRONG&gt;00:1C:14&lt;/STRONG&gt; - reserved prefix for some future products ?! &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Q: &lt;EM&gt;But can I reuse the automatically generated MAC address which starts with 00:0c:29 (and of course make sure ESXi won't use the same MAC address for another VM)?&lt;/EM&gt;&lt;/P&gt;&lt;P&gt;A: Autogenerated MAC addresses assigned by ESXi host/vCenter are checked for possible conflicts on creation ... but static MAC addresses which you set doesn't&lt;/P&gt;&lt;P&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp; i.e. &lt;STRONG&gt;if you&lt;/STRONG&gt; manually configure two identical MAC on two VMs nothing will stop you because &lt;STRONG&gt;you are the arbiter.&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------&lt;/P&gt;&lt;P&gt;As an alternative you can switch from default VMware OUI to &lt;STRONG&gt;range- or prefixed-based MAC address allocation &lt;/STRONG&gt;by changing the vCenter server Advanced Settings:&lt;/P&gt;&lt;P&gt;For detailed steps and explanation see this part of documentation:&lt;/P&gt;&lt;P&gt;&lt;A href="http://pubs.vmware.com/vsphere-55/topic/com.vmware.vsphere.networking.doc/GUID-832EB709-45ED-4FC5-BBC2-8C35615C2F8E.html" title="http://pubs.vmware.com/vsphere-55/topic/com.vmware.vsphere.networking.doc/GUID-832EB709-45ED-4FC5-BBC2-8C35615C2F8E.html"&gt;Change to or Adjust Range- or Prefixed-Based Allocations in the vSphere Web Client&lt;/A&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;... but go for it only in extreme cases and double check if your new range isn't in conflict with already registered OUIs:&lt;/P&gt;&lt;P&gt;&lt;SPAN style="text-decoration: underline;"&gt;&lt;A class="jive-link-external-small" href="https://standards.ieee.org/develop/regauth/oui/oui.txt"&gt;https://standards.ieee.org/develop/regauth/oui/oui.txt&lt;/A&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 20 Nov 2014 10:32:48 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932653#M79841</guid>
      <dc:creator>vNEX</dc:creator>
      <dc:date>2014-11-20T10:32:48Z</dc:date>
    </item>
    <item>
      <title>Re: Static MAC address not starting with 00:50:56?</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932654#M79842</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE&gt;
&lt;P&gt;Tim Scheppeit wrote:&lt;/P&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;Hey,&lt;/P&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;this KB is only valid until ESX 2.5&lt;/P&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;Is this really the version you are using?&lt;/P&gt;
&lt;/BLOCKQUOTE&gt;&lt;P&gt;No, not at all!&amp;nbsp; I'm using 5.5 :smileylaugh:&amp;nbsp; A proof that I needed the sleep badly :smileygrin:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;BLOCKQUOTE&gt;
&lt;P&gt;&lt;/P&gt;
&lt;P&gt;The valid guide for ESXi 5.5 can be found here: &lt;A class="jive-link-external-small" href="http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-552-networking-guide.pdf"&gt;http://pubs.vmware.com/vsphere-55/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-552-networking-guide.pdf&lt;/A&gt;&lt;/P&gt;
&lt;/BLOCKQUOTE&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thanks&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 20 Nov 2014 13:45:47 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Static-MAC-address-not-starting-with-00-50-56/m-p/932654#M79842</guid>
      <dc:creator>Horinius</dc:creator>
      <dc:date>2014-11-20T13:45:47Z</dc:date>
    </item>
  </channel>
</rss>

