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MAC Address for VMmware

I have a VMware 4.0 host and with two physical ports (00:25:b3:23:ae:xx). They are grouped into a virtual switch.

There are three VM guests and their MAC addresses (virtual) are

00:0c:29:48:9c:ec server1
00:0c:29:10:b5:cd server2
00:0c:29:52:28:ce server3

1. What's the pattern of assign the MAC address to each VM guest ? Does it always start with "00:0c:29" ?

2. I can access the Corp Switches. On each VM guest, I notify that the "00:00c:29" is used to communicate. On the physical switch, will the virtual MAC address "00:00c:29" or the physical "00:25:b3:23:ae:xx" be seen ?

Thanks
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AXISHK
Asked:
AXISHK
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3 Solutions
 
John HurstBusiness Consultant (Owner)Commented:
00:0c is the manufacturer code. That is why they are all the same for the three NICs. You should leave the MAC address alone, in my opinion.

... Thinkpads_User
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John HurstBusiness Consultant (Owner)Commented:
Here is a MAC lookup site.

http://www.macvendorlookup.com/

The MAC's you showed are assigned to VMware for their virtual hardware.

.... Thinkpads_User
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AXISHKAuthor Commented:
What's the pattern of MAC address for VM host assigning to VM guests ? Does it alway start  with "00:0c:29" ?

Any comment for question 2 ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
ah, yes I also forgot if you use a different virtual nic type you may also see MAC Addresses with 00:0c:29

also see here

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=219

00:25:b3 is a HP MAC Address.
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AXISHKAuthor Commented:
Thanks.

Refer to my question 2 : on the physical switch, will the virtual MAC address "00:00c:29" or the physical "00:25:b3:23:ae:xx" be seen ?

Tks again.
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deroodeCommented:
On the switch you will see the Virtual Mac address; That is the only way that a virtual server or workstation would be able to contact a DHCP server and get a separate ip address

On Vmware Workstation you can configure a network adapter as "NAT", it will get an ip address from the Workstation VMware dhcp pool, and communicate to the outside with the physical workstation IP and MAC-address.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
these MAC addresses will be seen

00:00c:29

as for 00:25:b3:23:ae:xx, not sure what MAC Address this is!
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John HurstBusiness Consultant (Owner)Commented:
00:25 is a Hewlett Packard address.

Does your siwtch care?  I have not had to worry about MAC addresses of equipment at clients.

... Thinkpads_User
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AXISHKAuthor Commented:
00:25:b3:23:ae:xx (where xx may be ae, ac,..) are the physiccal MAC address of the VMware host.

My question is physical address is attached to the switch but each VM guests have its own virtual MAC, so what MAC address is logged in the switch.

I need to make of this information to identify which ports are connected to which VMware hosts.
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deroodeCommented:
As i said before: The switch will see the VMware Mac addresses 00:00c:29 (as well as the HP mac address)
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AXISHKAuthor Commented:
I can't access corporate switches which is managed by Network team.

However, each physical ports of the switch will learn which device is attached to the the port and record down a MAC address. To my knowledge, only a MAC address is recorded. Am I correct ?

Thank again.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That's correct, they will exist in the Switch ARP table.
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