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'[OT] Network Card Address'
1999\03\30@095724 by Montaigne, Mike

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I need two network cards with the same address,
Does anyone where I can buy two/another card
with a specified address?

I want to set up two PC's to look exactly the same.

tks

Mike

1999\03\30@100746 by Dave VanHorn

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>I need two network cards with the same address,
>Does anyone where I can buy two/another card
>with a specified address?
>
>I want to set up two PC's to look exactly the same.



The NIC address is hard coded, and you literally can't buy two the
same.
If you're talking about the IP address, just set it that way.
Obviously both computers can't be on the network at the same time.

1999\03\30@101351 by Max Toole

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In a message dated 3/30/99 8:57:27 AM Central Standard Time,
spam_OUTmontaignemTakeThisOuTspamAECL.CA writes:

> I need two network cards with the same address,
>  Does anyone where I can buy two/another card
>  with a specified address?
I think most are configureable.  I use the 3COM 3C509B and it comes with a
utility to allow you to set the address.
Max

1999\03\30@103026 by Bob Drzyzgula

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It depends a fair bit on the OS as to whether you can do
this.

You generally cannot pre-specify the MAC address on a
card; the entire point of the MAC address system is to
have guaranteed-unique device IDs.  (MAC being "media
access control", and the MAC address consisting of a
three-byte OUI -- organizationally unique identifier --
followed by the three-byte device ID; the OUI is that of
the card manufacturer, and is assigned by the IEEE.)

However, the MAC address is stored in ROM on the card
and read in by the driver in the operating system,
which generally will then uses the in-memory copy
of the address in formatting and receiving packets.
Depending on the sophistication of the driver and
the utilities made available by the OS, you may be
able to override the MAC address on the card; the
OS driver will then just use the MAC address you tell
it to instead of the one on the card. In most
UNIX systems, this is implemented as an option on
the ifconfig command.

This won't make your two systems look identical from
a hardware standpoint, but if you always override
the MAC address on both machines, then you will be
able to make them functionally identical from a
whole-system perspective. This probably won't help
you if you need to net-boot those machines, unless
you have some fancy cards (I don't know of any that
will do this) that will let you override the MAC
address in firmware. You may be able to do this on
a Sun in the Open Boot Prom, but you weren't talking
about Suns.

--Bob

On Tue, Mar 30, 1999 at 09:55:03AM -0500, Montaigne, Mike wrote:
> I need two network cards with the same address,
> Does anyone where I can buy two/another card
> with a specified address?
>
> I want to set up two PC's to look exactly the same.
>
> tks
>
> Mike

--
============================================================
Bob Drzyzgula                             It's not a problem
.....bobKILLspamspam@spam@drzyzgula.org                until something bad happens
============================================================

1999\03\30@103412 by Clark, John

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Increasingly MAC addresses are being stored in NVRAM.


John Clark, Software Engineer
JohnCspamKILLspaminter-intelli.com
(317) 715-8175 (voice & fax)

Interactive Intelligence, Inc.
3500 DePauw Blvd., Suite 1060
Indianapolis, IN  46268-1136
http://www.inter-intelli.com

> {Original Message removed}

1999\03\30@171852 by Alan Nickerson

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Hmmm. Are you using MediaOne for Internet access?

Alan

-----Original Message-----
From: Montaigne, Mike <.....montaignemKILLspamspam.....AECL.CA>
To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Date: Tuesday, March 30, 1999 10:05 AM
Subject: Re: [OT] Network Card Address


{Quote hidden}

1999\03\30@233816 by Doc

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Cabletron E21xx and E22xx cards allow you to manually set the MAC address
using supplied software.


-----Original Message-----
From: Montaigne, Mike <@spam@montaignemKILLspamspamAECL.CA>
To: <KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU>
Date: Tuesday, March 30, 1999 9:57 AM
Subject: Re: [OT] Network Card Address


{Quote hidden}

1999\03\31@145755 by Mark Willis

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Some earlier cards use a (GAL?  small ROM or PROM?  I forget what part
it is!  Been a while.) - little 16-pin DIL chip to store the MAC
address.  Get two of those, copy one of the GALs (eeProms?  Whatever the
heck they are!), and you're set, worst case.  I can probably find you
two of such cards, you'll know you have such a card as it usually has a
SOCKET in there with a DIL plugged in that has a 6-hex-digit ID number
(the second half of the MAC address), actually I have some Gateway
Communications Ethernet cards (10Base T/2 combo cards, jumpered type)
that should have one, I can go find one & see what part they have
plugged in.  If you can deal with 2 of those (Ne2000 clone), I can sure
sell them off (I've since moved to SMC cards.)  Though SMC's may do it
all in NVRam, and be configurable.

 Think cards like a 3C501, for the type of card I'm thinking of here.
You'll see a little paper label (hand-written or machine-printed) with 6
Hex digits on it, atop a DIL-16 chip.

 Think lowish performance, too, compared to 100BaseT <G>  Which may be
just fine, for what you want!

 Mark

Montaigne, Mike wrote:
{Quote hidden}


'[OT] Network Card Address'
1999\04\01@165829 by Cranston Grey
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The MAC address can be overridden. It's called locally administired
address. It's a parameter on the command line or a field in the driver
screen. Depending on which OS/protocal you are working with.

Can't think why you might want to do it. Oh well, have at it.



>From: Mark Willis <RemoveMEmwillisTakeThisOuTspamNWLINK.COM>
>Reply-To: pic microcontroller discussion list <spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU>
>To: TakeThisOuTPICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU
>Subject: Re: [OT] Network Card Address
>Date: Wed, 31 Mar 1999 11:56:19 -0800
>
>Some earlier cards use a (GAL?  small ROM or PROM?  I forget what part
>it is!  Been a while.) - little 16-pin DIL chip to store the MAC
>address.  Get two of those, copy one of the GALs (eeProms?  Whatever
the
{Quote hidden}

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