Same MAC address range with 2 vSphere Virtual Center

[FMorales]

Hello, we have two vSphere virtual center that create VM with the same MAC address range,

00:56:b0:00:00 ........ that the other one virtual center ..... so we have to be very carefully for not

duplicate VM with the same mac address...

Could I change the AUTOMATIC range assignment of one of our virtual centers?

Thanks a lot

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Francisco Javier Morales López de Gamarra

Vmware VCP | LPI - CCNA

Edited all caps subject line according to the forum rules, AWo.

[timemachine]

the mac address range that you are talking about is the vmware proprietary mac address.

according to my knowledge i dont think we can change these macs, as they are coming from the vmkernel .

[FMorales]

So .... If I have more that one virtual center of the same version .... I could have a very very big problems in my network .....is not it???

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Francisco Morales López de Gamarra

Vmware VCP | LPI - CCNA

[timemachine]

......no....according to my knowledge the vms will have only the first few hexcodes in common and the vcenter is designed in such a way that no two vms have the same mac

[FMorales]

But .... If I move a VM from a Virtual Center to the other .... and If I answer .... "KEEP" .... the VM could have the same MAC address that other in the same virtual center is not it?

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Francisco Morales López de Gamarra

Vmware VCP | LPI - CCNA

[FMorales]

For example ....

I have created THE FIRST VM in the first Virtual Center after a fresh installation..... the MAC address is:

00:56:b0:00:00 for the first VM created

and now ..... If I create one VM on the SECOND virtual center ... after a fresh installation ... the MAC address for the first VM is:

00:56:b0:00:00 too !!!!!!!!!!!!!!!!!!!!!!!!!

so .... big problem ....

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Francisco Morales López de Gamarra

Vmware VCP | LPI - CCNA

[FMorales]

..... vcenter is designed in such a way that no two vms have the same mac .....

Yes ... but .... what happend is you have two virtual center .... and they dont have coummunications between?

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Francisco Morales López de Gamarra

Vmware VCP | LPI - CCNA

[Rubeck · Accepted solution]

If you have two vCenter servers make sure that they have different instance IDs as these are used to generate MAC addresses and UUIDs for VM's..

This is explained in this KB here:

/Rubeck

[FMorales]

Yes !!!; The second Virtual Senter is a CLON of the VM where is the first Virtual Center ...... !!!! so ... the second Virtual Center it has the sane UID

installation !!

Thanks

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Francisco Morales López de Gamarra

Vmware VCP | LPI - CCNA