Ethernet LAN Change MAC address

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Subject Author Date
Change MAC address leonlai2k 01-25-05
---> Re: Change MAC address William P.N. Smith01-25-05
Posted by on January 25, 2005, 8:53 am
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Hi,

I have 2 networking devices which are the same. But the MAC addresses
can be changed. When I connect them to a hub, do I need to change the
MAC address so that they have different MAC addresses?

Thanks!



Posted by James Knott on January 25, 2005, 3:14 pm
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leonlai2k@yahoo.com wrote:


Are you saying they have the same mac?  That's unual.  Some computer NICs
can be changed, but without further info, I haven't any idea about what
you've got.



Posted by on January 25, 2005, 4:22 pm
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leonlai2k@yahoo.com wrote:

What kind of devices?

In general (plus or minus the discussion in this ng about what happens
or how it should be handled when two MAC addresses are the same),
every single MAC address should be globally unique.



Posted by James Knott on January 25, 2005, 8:17 pm
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William P.N. Smith wrote:


However, unique MACs are only required on the local network.  One you pass
through a router, the original MAC is lost, along with the rest of the
original ethernet (or other) frame.



Posted by Walter Roberson on January 25, 2005, 10:05 pm
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 <William P.N. Smith> wrote:

:In general (plus or minus the discussion in this ng about what happens
:or how it should be handled when two MAC addresses are the same),
:every single MAC address should be globally unique.

Though that's not the underlying definition: the underlying
requirement is not -global- uniqueness, but rather uniqueness
per segment.
--
   Reviewers should be required to produce a certain number of
   negative reviews - like police given quotas for handing out
   speeding tickets.                        -- The Audio Anarchist


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