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
AXISHKAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

JohnBusiness 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
0
JohnBusiness 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
0
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 ?
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

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.
0
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.
0
deroodeSystems AdministratorCommented:
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.
0
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!
0
JohnBusiness 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
0
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.
0
deroodeSystems AdministratorCommented:
As i said before: The switch will see the VMware Mac addresses 00:00c:29 (as well as the HP mac address)
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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.
0
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That's correct, they will exist in the Switch ARP table.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
VMware

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.