MAC: 00-00-00-00-00-00

MAC: 00-00-00-00-00-00
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Subject Author Date
MAC: 00-00-00-00-00-00 Howard Huntley 06-26-2008
Posted by Howard Huntley on June 26, 2008, 12:41 am
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What is going on, My Vista home ultimate HP dv9000z notebook is
sending LAN a MAC: 00-00-00-00-00-00, I tested it with a fluke
Lanmeter and verified that it is as it appears. When I used ARP, I am
also showing a print server as having the same MAC:00-00-00-00-00-00.
What is going on with this? Can any one give me some insite as to what
is happening??

Pure Networks
Posted by News Reader on June 26, 2008, 3:45 pm
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Howard Huntley wrote:
> What is going on, My Vista home ultimate HP dv9000z notebook is
> sending LAN a MAC: 00-00-00-00-00-00, I tested it with a fluke
> Lanmeter and verified that it is as it appears. When I used ARP, I am
> also showing a print server as having the same MAC:00-00-00-00-00-00.
> What is going on with this? Can any one give me some insite as to what
> is happening??

The only usage of 00-00-00-00-00-00 that comes to mind is Gratuitous ARPs.

Upon receiving a lease on an IP address, a Windows host sends three
Gratuitous ARP "Requests".

The host uses it's own addresses as the source addresses, and it's own
IP address as the destination address, but a target MAC address of
00:00:00:00:00:00.

Wouldn't think you would end up with an ARP entry based on a destination
MAC though.

Best Regards,
News Reader

Posted by Scott Perry on June 26, 2008, 4:03 pm
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If you try to reach an IP address that does not exist on your network,
Windows shows this IP address to have MAC address 00-00-00-00-00-00 in your
ARP table. It means that the host did not respond to the initial ARP
request.
Try it:
PING an IP address in your subnet that does not exist and then type "arp -a"
at a command prompt. You will see it. The type category will probably show
as invalid.

-----
Scott Perry
Indianapolis, IN
-----

> What is going on, My Vista home ultimate HP dv9000z notebook is
> sending LAN a MAC: 00-00-00-00-00-00, I tested it with a fluke
> Lanmeter and verified that it is as it appears. When I used ARP, I am
> also showing a print server as having the same MAC:00-00-00-00-00-00.
> What is going on with this? Can any one give me some insite as to what
> is happening??




other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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