So, after getting first number, can we create our own as far as they are not
duplicated in sequential fashion? I was of the impression that IEEE issues
the block of numbers and once we used them all, call IEEE and get another
block.
Please clarify.
re,
ken patel
-----Original Message-----
From: McMonagle, Mike [mailto:[log in to unmask]]
Sent: Thursday, September 21, 2000 10:32 AM
To: [log in to unmask]
Subject: Re: [TN] Need basic info on MAC address
Tom,
I appreciate for the clarification, I didn't know
that the IEEE controlled MAC addresses. I had though that they were
user-developed, as long as they were not duplicated within their own
products. Learn something new everyday, thanks....
Mike
-----Original Message-----
From: William T. (Tom) Taylor
[mailto:[log in to unmask]]
Sent: Thursday, September 21, 2000 12:20
PM
To: [log in to unmask]
Subject: Re: [TN] Need basic info on
MAC address
With a few exceptions, every Ethernet
adapter in the world has a unique
48-bit MAC address, or 12 hex digits. A
vendor reserves a block of
addresses from the IEEE, and is assigned one
or more unique 6 hex digit
values that will form the most significant
portion of the MAC address. The
vendor then sequentially assigns numbers
from this block to individual
adapters by incrementing the least
significant 6 hex digits. This value is
typically stored in onboard FLASH so it is
possible to change it for special
circumstances. Network analyzers can
usually identify the manufacturer of
the adapter that sent a packet by looking up
the first 6 hex digits of the
MAC address in a table. Many schemes rely
upon the uniqueness of the MAC
address. It can be used to assign a
Globally Unique Identifier (GUID) to
module interfaces developed on that
computer. It may be embedded in
software that doesn't use a dongle to
restrict the use of that software to a
single machine. It may be put on a
reservation list in a DHCP server so
that the same IP address is always assigned
to the machine containing that
adapter. It is also very important in the
low levels of TCP/IP for directly
routing a packet to a specific host.
-- Tom Taylor
----- Original Message -----
From: "McMonagle, Mike" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, September 21, 2000 12:41 PM
Subject: Re: [TN] Need basic info on MAC
address
> Ken,
> MAC addresses are
used to unique addresses that
> identify duplicate devices on a network
that are from the same
manufacturer,
> such as network cards. There is no
controlling organization, you create
them
> yourself for your specific products, and
you control them to prevent
> duplication of the same address being used
on multiple units. You can get
a
> short primer on the various network
addressing schemes at :
>
>
http://www.ieng.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm#xtocid1
> 304523
>
<http://www.ieng.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm#xtocid
> 1304523>
>
> Mike McMonagle
> Senior SMT Engineer
> Telxon Corporation
> www.telxon.com
<http://www.telxon.com>
>
>
>
-----Original Message-----
> From:
Ken Patel
> [mailto:[log in to unmask]]
> Sent:
Thursday, September 21, 2000 10:57
> AM
> To:
[log in to unmask]
> Subject:
[TN] Need basic info on
MAC
> address
>
> What is
MAC address and how is being
> controlled? Who issue them? Are there
> many ways
to control it?
>
> re,
> ken patel
>
>
>
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