Mac addresses of NICs (why are they the same) Post: 22106

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Top Forums UNIX for Dummies Questions & Answers Mac addresses of NICs (why are they the same) Post 22106 by thehoghunter on Tuesday 28th of May 2002 10:38:00 AM

05-28-2002

thehoghunter

Guest

This might help - found on SunSolve. You can read it by going there and doing a search for "why same ether address on all interfaces"

IEEE leaves it up to the vendor to use the station address approach vs.
per port approach. Sun uses the concept of a host-based MAC identity prior
to the newer nic cards.

Usually this does not present a problem. Only systems on the same subnet
(connected to same switch/hub) are required to have unique hardware address
(arp entries).

If you are configuring a multi-homed host with more than one interface on the
same physical subnet (connections to same hub), choosing and configuring a
unique ether address that is different from the primary host-based assigned
ethernet Mac address may be neccessary.

The older network interface drivers in Sun systems get the MAC address for the
ethernet interface from the PROM on the system. The MAC address does not come from
the ethernet chip or interface hardware. There is just one ethernet MAC address for all
interfaces on a system. The intel (ie), lance (le )ethernet interfaces along with the
SunSwift (hme) and SunFastEthernet 1.0 (be) and 2.0 Adapters (hme) use the host assigned
address of the CPU OpenBoot PROM.

Sun Microsystems reserved ethernet range starts with 8:0:20:xx:xx:xx

thehoghunter

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install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)